Diet and Exercise

Chapter 17: Diet, Exercise, and Lifestyle — Fueling Your Body During and After Treatment

Opening Story

When David was diagnosed with intermediate-risk prostate cancer at 62, he weighed 240 pounds, walked only to his car, and ate fast food most days. His radiation oncologist told him something unexpected: "The most powerful thing you can do right now — besides your treatment — is move your body and change what's on your plate." David was skeptical. But his wife joined him, and together they started walking 20 minutes a day and cooking Mediterranean meals at home. By the end of his radiation, David had lost 18 pounds, had more energy than he'd had in years, and his side effects were milder than expected. "I can't control the cancer," he said, "but I can control what I eat and how I move. That gave me my power back."

Part 1: Why Diet and Exercise Matter in Prostate Cancer

Cancer treatment happens in the clinic — but what you do at home matters too. A growing body of evidence shows that diet and exercise are not just "nice to have" during cancer treatment. They are powerful tools that can improve how you feel, how well you tolerate treatment, and possibly how long you live.

The landmark CHALLENGE trial (2025)

For decades, doctors suspected that exercise could improve cancer outcomes, but there was no definitive proof from a randomized trial. That changed in 2025 with the CHALLENGE trial — the first phase 3 randomized trial to prove that exercise improves cancer survival.

In this trial, 889 patients with resected colon cancer who had completed chemotherapy were randomized to either a 3-year structured exercise program or health-education materials alone. At a median follow-up of 7.9 years, the results were striking:

• Disease-free survival was significantly longer in the exercise group (hazard ratio 0.72; 5-year disease-free survival 80.3% vs. 73.9%).
• Overall survival also favored the exercise group (hazard ratio 0.63; 8-year overall survival 90.3% vs. 83.2%).
• The benefit of exercise was comparable to many standard drug treatments used in cancer care.
• A cost-effectiveness analysis found that the exercise program was actually less costly and more effective than no exercise — it was "dominant," meaning it saved money while improving outcomes.

While this trial was in colon cancer, the implications are enormous for all cancers, including prostate cancer. The NCCN Survivorship Guidelines now cite the CHALLENGE trial as category 1 evidence supporting structured exercise for colon cancer survivors, and recommend at least 150 minutes of moderate-intensity or 75 minutes of vigorous-intensity activity per week for all cancer survivors.¹

Why does this matter for prostate cancer specifically?

Observational studies have consistently shown that physical activity after a prostate cancer diagnosis is associated with better outcomes:

• A comprehensive meta-analysis of almost 1.5 million cancer patients found that post-diagnosis physical activity was associated with a 27% reduction in prostate cancer-specific mortality (HR 0.73) and a 32% reduction in all-cause mortality (HR 0.68).² ³
• The American Cancer Society (ACS) Prostate Cancer Survivorship Guidelines report that higher physical activity is associated with a 31% reduced risk of prostate cancer-specific mortality and a 40% reduced risk of all-cause mortality.⁴
• A large pooled analysis of six US cohort studies found that engaging in recommended amounts of moderate-to-vigorous physical activity (7.5–15 MET-hours/week) was associated with a 40% lower risk of death in prostate cancer survivors.⁵
• Men achieving ≥9 MET-hours/week of total physical activity (approximately 30 minutes of walking most days) had reduced overall mortality, while reductions in prostate cancer-specific mortality were observed at higher intensity levels (≥3 hours/week of vigorous activity such as jogging). A Swedish cohort found a 39% reduction in prostate cancer death with just 20 minutes/day of walking or biking.⁶
• A recent study from the Health Professionals Follow-up Study found that both vigorous and non-vigorous physical activity after diagnosis were associated with lower all-cause mortality, and that combining high physical activity with an anti-inflammatory, anti-insulinemic diet produced approximately 30–36% lower mortality risk.⁷

The ongoing international INTERVAL-GAP4 trial is testing whether supervised exercise improves overall survival in men with metastatic prostate cancer — results are expected in 2025–2026.⁶

Obesity and prostate cancer

Obesity is associated with higher-grade disease at diagnosis, higher recurrence rates, and higher mortality from prostate cancer. The biological mechanisms linking obesity to worse cancer outcomes include elevated insulin and insulin-like growth factor-1 (IGF-1), chronic inflammation, altered sex hormone levels, and impaired immune function. A recent JAMA Network Open study found that maintaining a healthy BMI (18.5–30) and engaging in more than 15 MET-hours/week of moderate-to-vigorous physical activity after diagnosis were each independently associated with lower risks of all-cause, cardiovascular, and prostate cancer-specific mortality. Maintaining high ACS guideline concordance both before and after diagnosis was associated with a 32% reduction in prostate cancer-specific mortality.⁵

The "doing something" factor

Beyond the biological benefits, diet and exercise give you something powerful: a sense of control. A cancer diagnosis can make you feel helpless. Choosing to eat well and move your body is something you can actively do every day — and the psychological benefit of that agency should not be underestimated.

📊 Illustration 17.1 — The CHALLENGE Trial: Exercise Improves Cancer Survival (simplified Kaplan-Meier curves showing disease-free and overall survival for exercise vs. control)

Part 2: Nutrition — What Does the Evidence Actually Say?

The internet is full of claims about miracle foods and cancer-curing diets. The reality is more nuanced — but also more encouraging than you might think. While no single food can cure prostate cancer, the overall pattern of what you eat matters.

The Mediterranean diet — the strongest overall evidence

The Mediterranean diet — rich in vegetables, fruits, fish, legumes, olive oil, and whole grains, with limited red and processed meat, refined sugars, and high-fat dairy — has the most consistent evidence for benefit in prostate cancer.

• A 2025 systematic review in European Urology of 63 studies (49 cohort studies, 14 RCTs) found that among men already diagnosed with prostate cancer, Mediterranean, plant-based, and low-inflammatory diets were most consistently linked to lower risk of progression and prostate cancer-specific mortality.⁸
• A 2026 systematic review in the Journal of Urology of 21 studies confirmed that following Mediterranean, Healthy Eating Index, and Prudent dietary patterns, along with healthy behaviors, was associated with lower risk of all-cause mortality, while the Western dietary pattern was associated with increased risk.⁹
• In an active surveillance cohort of 410 men, higher adherence to the Mediterranean diet was associated with a lower risk of Gleason grade group progression (HR 0.88 per 1-unit increase in Mediterranean diet score). The benefit was particularly strong in non-White men and men without diabetes.¹⁰
• A large Spanish case-control study found that high adherence to a Mediterranean dietary pattern was specifically associated with a lower risk of aggressive prostate cancer (Gleason >6; relative risk 0.68) and higher clinical stage disease (relative risk 0.49).¹¹
• The Health Professionals Follow-up Study (2026), analyzing 6,085 men with prostate cancer over 71,760 person-years, found that greater post-diagnosis adherence to the Alternative Healthy Eating Index (AHEI) and Mediterranean diet (AMED) was associated with 20–25% lower all-cause mortality. Benefits were stronger among men with less aggressive disease.¹²
• A meta-analysis of cancer patients' survival found that higher Mediterranean diet adherence was associated with reduced overall mortality in prostate cancer patients specifically (HR 0.97).¹³
• An earlier meta-analysis found a 4% reduction in overall prostate cancer risk with highest Mediterranean diet adherence.¹⁴
• A large meta-analysis of 126 studies with more than 8 million participants found that higher adherence to the Mediterranean diet was associated with reduced cancer-related mortality overall (RR 0.97 per one-point increase in adherence).¹⁵

Important caveat: Most evidence is observational. A recent editorial in Cancer Epidemiology, Biomarkers & Prevention cautioned that while diet is a "promising side dish," it should not be positioned as a standalone therapy — it is best viewed as complementary to standard treatment. Positioning diet as a standalone therapy risks overstating its benefits.¹⁶ Diet alone is not a substitute for surgery, radiation, or hormone therapy.

Specific foods and nutrients

Lycopene (tomatoes, watermelon, pink grapefruit)

Lycopene is the red pigment in tomatoes and is one of the most studied nutrients in prostate cancer. The evidence is encouraging:

• A dose-response meta-analysis of 42 studies (692,012 participants, 43,851 cases) found that both dietary lycopene intake and circulating lycopene levels were significantly associated with reduced prostate cancer risk (RR 0.88 for both). Prostate cancer risk decreased by 1% for every additional 2 mg of lycopene consumed daily.
• The Health Professionals Follow-up Study found that higher lycopene intake was inversely associated with lethal prostate cancer (HR 0.72 for highest vs. lowest quintile among screened men), and that lycopene-rich diets were associated with tumors that had less angiogenic potential.
• A prospective cohort from the PREDIMED trial found that men in the highest quartile of lycopene intake had a 54% lower risk of prostate cancer (HR 0.46), with a significant inverse association emerging at intakes above 4.9 mg/day.
• Cooked tomato products (tomato sauce, paste) provide more bioavailable lycopene than raw tomatoes. Tomato sauce was associated with a 23% reduction in prostate cancer risk in the Health Professionals Follow-up Study.
• However, a Cochrane review noted that lycopene supplements have not shown the same benefits as dietary intake in randomized trials, and concluded there is insufficient evidence from RCTs alone to support or refute lycopene supplementation for prostate cancer prevention.

Bottom line: Eat cooked tomato products regularly. Supplements have not replicated the benefits of whole foods.

Cruciferous vegetables (broccoli, cauliflower, kale, Brussels sprouts)

Cruciferous vegetables contain sulforaphane, a compound with anti-cancer properties in preclinical studies. Epidemiologic data are supportive but not definitive. Including these vegetables in your diet is recommended as part of an overall healthy eating pattern.

Green tea catechins (EGCG)

Green tea contains epigallocatechin gallate (EGCG), which inhibits cell proliferation and modulates the androgen receptor in preclinical studies. However, clinical evidence is limited — small trials have produced inconsistent results. Green tea is a healthy beverage but should not be relied upon as a cancer prevention strategy.

Soy and phytoestrogens

Asian populations with high soy intake have lower prostate cancer rates. Isoflavones in soy may modulate estrogen receptors. Some studies have found inverse associations between plasma isoflavone levels and prostate cancer risk, particularly in Asian populations. However, evidence is insufficient for a strong recommendation.

Polyphenols

A large prospective cohort study of 29,325 men found that higher polyphenol intake — especially flavanols from tea, fruit juices, and red wine — was associated with a significantly decreased risk of prostate cancer (HR 0.58 for highest vs. lowest quintile of flavanol intake). However, the large EPIC cohort study (131,425 men, 6,939 cases) found no associations between total polyphenol intake and prostate cancer risk. The evidence remains mixed.

Fish and omega-3 fatty acids

Conflicting data exist. Some studies show benefit, others show no effect or even harm at high supplemental doses. Eating fish as part of a Mediterranean diet is reasonable; high-dose fish oil supplements are not recommended specifically for prostate cancer prevention.

Foods and dietary patterns to limit

• Red and processed meat: The World Health Organization classifies processed meat as a Group 1 carcinogen and red meat as Group 2A (probable carcinogen). Limiting intake is prudent.
• High-fat dairy: Some studies associate high-fat dairy consumption with more aggressive prostate cancer.
• Excess sugar and refined carbohydrates: These drive insulin and IGF-1 signaling, which may promote cancer growth.
• Alcohol: Moderate consumption may be acceptable; heavy drinking is associated with worse outcomes.
• Charred/grilled meat: Cooking meat at very high temperatures produces heterocyclic amines (HCAs) and polycyclic aromatic hydrocarbons (PAHs), which are carcinogenic. Practical tips: marinate meat before grilling (reduces HCAs by up to 90%), use lower temperatures, avoid direct flame contact, and cut away charred portions.
• High-dose zinc supplementation: Supplementation of more than 75 mg per day for over 15 years may substantially increase the risk of lethal and aggressive prostate cancer.

📊 Illustration 17.2 — The Prostate Cancer Plate: ideal meal composition

📊 Illustration 17.3 — Mediterranean Diet Pyramid adapted for prostate cancer

📊 Illustration 17.4 — Foods to Embrace vs. Foods to Limit (two-column visual)

Part 3: Nutrition During Treatment

Different treatments create different nutritional challenges. Here is how to adapt your eating during each phase:

During radiation therapy

Pelvic radiation can irritate the bowel and bladder. A low-residue diet during treatment can reduce diarrhea, bloating, and gas:

• Eat: White rice, white bread, lean proteins, bananas, applesauce, well-cooked vegetables without skins, eggs, smooth peanut butter.
• Limit: High-fiber foods (raw vegetables, whole grains, beans, nuts, seeds), spicy foods, caffeine, alcohol, carbonated beverages, acidic juices (orange, grapefruit, tomato).
• Hydration: Drink plenty of water. Avoid caffeine and alcohol, which irritate the bladder. Herbal teas (non-caffeinated) are fine.
• Bladder filling: Your radiation team may ask you to have a comfortably full bladder for each treatment. Practice drinking a consistent amount of water at the same time before each session.

During hormone therapy (ADT)

ADT causes metabolic changes that require dietary attention:

• Weight gain: ADT causes an average of 2–4 kg weight gain in the first year, primarily as fat. Caloric needs decrease — you may need to eat less than before.
• Muscle loss: Protein intake becomes critical. Aim for 1.0–1.2 g of protein per kg of body weight daily. Good sources: fish, chicken, eggs, Greek yogurt, beans, lentils.
• Bone health: Calcium (1000–1200 mg/day from food and supplements) and vitamin D (target blood level 30–50 ng/mL) are essential to combat ADT-related bone loss.
• Metabolic syndrome: ADT increases the risk of diabetes, high cholesterol, and cardiovascular disease. A Mediterranean diet pattern helps address all of these simultaneously.

During chemotherapy

• Nausea management: Eat small, frequent meals. Ginger (ginger tea, ginger chews) can help. Bland carbohydrates (crackers, toast) are often tolerated.
• Taste changes: Chemotherapy can alter taste. Try different seasonings, eat foods at room temperature, and use plastic utensils if metallic taste is a problem.
• Protein priorities: Maintain protein intake to support immune function and prevent muscle wasting.
• Appetite loss: Nutrient-dense snacks (nuts, avocado, smoothies with protein powder) can help when full meals are unappealing.

After treatment

Transition to a long-term healthy eating pattern — the Mediterranean diet is the best-studied model. This is not a temporary "cancer diet" but a lifelong approach to eating that benefits your heart, your bones, your weight, and potentially your cancer outcomes.

📊 Illustration 17.5 — Eating During Treatment: radiation vs. ADT vs. chemotherapy comparison table

Part 4: Weight Management

Why weight matters

Excess body weight — particularly visceral fat (the fat around your organs) — is associated with worse prostate cancer outcomes. BMI is a rough measure; waist circumference (>40 inches in men) may be a better indicator of metabolic risk.

The ADT weight gain challenge

Hormone therapy shifts your body composition: you lose muscle and gain fat, even if the scale does not change dramatically. This is why resistance training (see Part 5) is so critical during ADT.

Practical strategies

• Track your weight weekly — small changes are easier to correct than large ones.
• Reduce portion sizes gradually rather than making dramatic dietary changes.
• Focus on nutrient-dense foods that keep you full: vegetables, lean proteins, whole grains, healthy fats.
• Avoid liquid calories (sugary drinks, juice, alcohol).
• If you are struggling, ask your doctor for a referral to a registered dietitian who specializes in oncology nutrition.

The cost of healthy eating

Eating well does not have to be expensive:

• Frozen vegetables are nutritionally equivalent to fresh and often cheaper.
• Beans and lentils are among the least expensive protein sources available.
• Buy seasonal produce — it is fresher and less expensive.
• Cook at home more often — restaurant meals are typically higher in calories, sodium, and cost.
• Many cancer support organizations offer free nutrition counseling and meal planning assistance.

Part 5: Exercise — The Most Underused Cancer Treatment

If exercise were a pill, it would be the most prescribed medication in oncology. The evidence is overwhelming — and yet most cancer patients do not exercise enough.

What the guidelines say

Multiple major organizations now recommend exercise as a standard part of cancer care:

• NCCN Survivorship Guidelines recommend at least 150 minutes of moderate-intensity or 75 minutes of vigorous-intensity activity per week, plus 2–3 sessions per week of strength/resistance training. This is now category 1 evidence for colon cancer survivors based on the CHALLENGE trial, and category 2A for other cancer survivors. If feasible and safe, survivors should aim for an ultimate goal of 300 minutes of moderate or 150 minutes of vigorous activity per week.¹
• ASCO guidelines (2022) recommend that oncology providers should recommend aerobic and resistance exercise during active treatment with curative intent. Exercise reduces fatigue, preserves cardiorespiratory fitness and physical function, and improves quality of life. Exercise helped preserve strength especially in men with prostate cancer undergoing ADT.
• American Cancer Society Guidelines report that ≥3 hours/week of vigorous activity is associated with a 61% reduction in prostate cancer-specific death and approximately 50% reduction in all-cause mortality.⁴ ⁶
• ACSM Roundtable recommends moderate-intensity aerobic exercise ≥3 times/week for ≥30 minutes for ≥8–12 weeks, plus resistance training ≥2 times/week. The panel recommends at least 30 minutes of brisk walking or other related exercises per day, as well as upper and lower body resistance training every other day.⁶

The biological mechanisms

Exercise modulates inflammation by reducing proinflammatory cytokines, enhances antitumor immunity via activation of natural killer cells and CD8+ T lymphocytes, improves metabolic regulation by increasing insulin sensitivity and lowering circulating insulin and IGF-1 levels, and inhibits key oncogenic pathways crucial for tumor growth and survival. Exercise also supports genomic stability by upregulating DNA repair enzymes.¹⁷

Types of exercise

Aerobic exercise — the foundation

This is any activity that raises your heart rate and makes you breathe harder: walking, jogging, cycling, swimming, dancing, gardening.

• The talk test: Moderate intensity = you can talk but not sing. Vigorous intensity = you can say a few words without stopping to catch your breath.
• Goal: At least 150 minutes of moderate-intensity or 75 minutes of vigorous-intensity activity per week, spread across most days.

Resistance/strength training — critical during ADT

ADT causes muscle loss and bone thinning. Resistance training directly counteracts both:

• Use body weight exercises (push-ups, squats, lunges), resistance bands, or weights.
• Target major muscle groups: legs, back, chest, shoulders, arms, core.
• Goal: 2–3 sessions per week on non-consecutive days.

Flexibility and balance

• Stretching after exercise reduces injury risk and improves range of motion.
• Balance training (tai chi, single-leg stands) is especially important for men on ADT, who are at increased risk of falls and fractures.

Pelvic floor exercises (Kegels)

These are covered in detail in Chapters 9 and 18. They are critical before and after surgery and can also help with urinary symptoms during and after radiation.

Starting from zero

If you have not exercised in years, start small:

• Week 1–2: Walk 10 minutes, 3 days per week. Do 5 minutes of simple resistance exercises (wall push-ups, chair squats) on 2 days.
• Week 3–4: Increase walking to 15 minutes. Add a second set of resistance exercises.
• Week 5–6: Walk 20 minutes, 4 days per week. Add light weights or resistance bands.
• Week 7–8: Walk 25–30 minutes. Increase resistance training to 3 sets.
• Gradual progression: Increase duration or intensity by no more than 10% per week.

Exercise during specific treatments

• During radiation: Light to moderate exercise is safe and beneficial. Walking and gentle resistance training can reduce fatigue.
• During ADT: Resistance training is especially important to preserve muscle and bone. Aerobic exercise helps manage weight and metabolic syndrome.
• During chemotherapy: Exercise on days you feel well. Even light walking helps. Listen to your body — some days will be better than others. Improved skeletal muscle mass has been observed among patients with CRPC treated with docetaxel.⁶
• After surgery: Follow your surgeon's restrictions (typically 4–6 weeks of limited lifting). Pelvic floor exercises can usually start early. Walking is encouraged from day one.

Exercise with bone metastases

Men with bone metastases can and should exercise, but with precautions:

• Avoid high-impact activities (running, jumping) near metastatic sites.
• Avoid heavy lifting that stresses bones with known metastases.
• Supervised exercise programs with an exercise physiologist or physical therapist are recommended.
• Physician clearance is essential — your doctor needs to know the location and extent of bone disease.
• Walking, stationary cycling, and upper-body resistance training (if metastases are in the spine or pelvis) are generally safe.
• Remote-monitored high-intensity interval exercise programs have shown benefits for patients with advanced prostate cancer.⁶

When NOT to exercise

• Acute illness or fever
• Severe anemia (hemoglobin 8 g/dL)
• Active bleeding
• Within 24 hours of chemotherapy if experiencing severe nausea or dizziness
• Unstable bone metastases (discuss with your doctor)

Referral to trained professionals

If you are unsure how to start, ask your doctor for a referral to:

• An ACSM-certified cancer exercise trainer
• An oncology physical therapist
• A cardiac rehabilitation program (many accept cancer patients)
• A YMCA LIVESTRONG program (free 12-week exercise program for cancer survivors)

Digital tools and apps

For patients in rural areas or with limited access to exercise programs:

• Fitness trackers (Fitbit, Apple Watch) can help monitor activity levels and set goals.
• Remote exercise programs and telehealth-based physical therapy are increasingly available.
• Virtual exercise programs are being tested in trials with a focus on enrolling Black and Hispanic patients.⁶

📊 Illustration 17.6 — Exercise Prescription Card (aerobic + resistance + flexibility)

📊 Illustration 17.7 — Starting From Zero: 8-week beginner exercise ramp-up

📊 Illustration 17.8 — NCCN Physical Activity Implementation Algorithm (simplified)

Part 6: Intermittent Fasting and the Gut Microbiome — Emerging Science

Intermittent fasting (IF) and time-restricted eating (TRE)

Intermittent fasting — particularly time-restricted eating (eating within a defined window, such as 8 hours per day) — has generated enormous patient interest. The science is intriguing but still early.

What the preclinical evidence shows:

Animal studies consistently show that intermittent fasting can reduce tumor growth, enhance the sensitivity of cancer cells to chemotherapy and radiation, and improve immune function. The mechanisms include reduced insulin and IGF-1 signaling, enhanced autophagy (cellular "cleanup"), and activation of stress-resistance pathways.

What the human evidence shows:

• A systematic review of TRE in cancer patients found high adherence rates (67–98%), improvements in quality of life, and some reductions in tumor markers. However, the studies were small and heterogeneous.
• A systematic review of intermittent fasting during chemotherapy confirmed safety and feasibility, with trends toward reduced insulin and IGF-1 levels, but no demonstrated impact on treatment outcomes or chemotherapy-related toxicities.
• A trial of daily caloric restriction in men with prostate cancer showed excellent adherence (95%) and no adverse events.
• A phase I/II study of TRE in head and neck cancer patients receiving immunotherapy found markedly improved disease control rates (85% vs. 50% at 3 months) with TRE, possibly mediated through changes in the gut microbiome and insulin signaling. This is preliminary but provocative.
• The ASCO guideline on exercise, diet, and weight management during cancer treatment (2022) stated that based on the early-stage nature of trials evaluating intermittent fasting, it is not possible to determine whether these diets offer any benefit to patients with cancer.

Important caveats:

• Risk of muscle loss, especially during ADT when muscle preservation is critical.
• Risk of energy depletion during radiation therapy.
• Insufficient evidence to recommend as standard practice.
• A CA: A Cancer Journal for Clinicians review concluded that patients undergoing active cancer treatment should not partake in intermittent fasting outside the context of a clinical trial.

Bottom line: Intermittent fasting is promising but unproven. Discuss with your doctor before starting any fasting regimen during treatment.

The gut microbiome — a new frontier

The "gut-prostate axis" is an emerging concept that links the trillions of bacteria in your intestines to prostate cancer biology.

What we know:

• Gut microbes influence prostate cancer through inflammation, immune regulation, hormone metabolism, and treatment response.
• A landmark 2021 study in Science demonstrated that commensal gut bacteria can promote castration resistance in prostate cancer by synthesizing androgens — essentially providing an alternative source of male hormones that fuel cancer growth even when medical castration has shut down testicular production.
• Studies have found that the gut microbiota composition differs significantly between men with and without prostate cancer, and that men with metastatic disease have increased abundance of bacteria involved in androgen metabolism.
• Microbial metabolites — including short-chain fatty acids (SCFAs), secondary bile acids, and trimethylamine N-oxide (TMAO) — can influence tumor growth, treatment resistance, and immune responses.
• Diet shapes the microbiome: fiber-rich, plant-based diets promote beneficial bacteria, while high-fat, high-sugar Western diets promote dysbiosis.

What is being explored:

• Probiotics, prebiotics, and dietary interventions to modify the gut microbiome
• Fecal microbiota transplantation (FMT) — in animal models, FMT from hormone-sensitive prostate cancer patients controlled tumor growth, while FMT from castration-resistant patients promoted resistance
• Microbiome profiling as a potential biomarker for treatment response

Bottom line: The gut-prostate axis is fascinating science, but not yet ready for clinical recommendations. The best current strategy is to eat a diverse, fiber-rich diet — which naturally promotes a healthy microbiome.

📊 Illustration 17.9 — The Gut-Prostate Axis (simplified diagram showing how gut bacteria influence prostate cancer through inflammation, hormone metabolism, and immune regulation)

Part 7: Integrative Therapies — What the Evidence Shows

"Integrative" medicine means using evidence-based complementary approaches alongside standard cancer treatment — not instead of it. This is different from "alternative" medicine, which replaces standard treatment (see Chapter 16 for a discussion of unproven alternative treatments).

A comprehensive narrative review in Seminars in Radiation Oncology (2026) synthesized the current evidence on mind-body interventions for cancer patients, noting that symptoms such as anxiety, fatigue, pain, sleep disturbance, and reduced quality of life remain highly prevalent during and after treatment, underscoring the need for interventions that address both psychological and physiological dimensions of distress.¹⁸

Yoga

Yoga combines physical movement, breathing exercises, and meditation. The evidence in prostate cancer is growing:

• A systematic review of 5 studies in prostate cancer survivors found that yoga has the potential to enhance erectile function, reduce fatigue and urinary symptoms, alleviate psychological stress, boost immune function, and improve overall quality of life.¹⁹
• A randomized phase II trial of twice-weekly yoga during radiation therapy for prostate cancer found significantly reduced fatigue (P.0001) and improved sexual health scores (P=.033) compared to no yoga.²⁰
• A pilot randomized controlled trial of yoga before radical prostatectomy found improvements in quality of life, increased circulating immune cells (CD4+ and CD8+ T-cells), and decreased inflammatory markers (granulocyte colony-stimulating factor, monocyte chemoattractant protein). The yoga group also showed decreased numbers of regulatory T-cells and myeloid-derived suppressor cells, indicating antitumor activity.²¹
• The ASCO-SIO fatigue guideline (2024 update) notes that while yoga shows promise during treatment, findings are inconsistent across trials, and robust conclusions cannot yet be drawn for the on-treatment period. For post-treatment fatigue, Hatha-based yoga programs are recommended.²⁰ ²²

Acupuncture

Acupuncture involves inserting thin needles at specific points on the body. It has the broadest evidence base among integrative therapies for cancer symptoms:

• An overview of 51 systematic reviews found that acupuncture is beneficial for cancer-related pain, fatigue, insomnia, nausea and vomiting, and hot flashes. No serious adverse events were reported.²³
• Acupuncture is particularly useful for managing ADT-related hot flashes, which affect up to 80% of men on hormone therapy. The MPOWER trial (2026) is an ongoing pilot randomized trial evaluating a standardized 10-week acupuncture protocol to reduce hot flashes in men receiving ADT.²⁴
• Acupuncture is regarded as a safe therapy for cancer patients, with no severe adverse events reported across systematic reviews.²³

Mindfulness and meditation

• Mindfulness-based stress reduction (MBSR) programs have been shown to reduce anxiety, improve sleep, and lower cortisol levels in cancer patients.¹⁸
• Particularly valuable for men on active surveillance, who live with the uncertainty of knowing they have cancer but are not receiving treatment.
• Also helpful for "PSA anxiety" — the stress that accompanies every PSA blood test.

Tai chi and qigong

• Improve balance and reduce fall risk — especially important for men on ADT, who have increased fracture risk.
• Improve quality of life and reduce fatigue.¹⁸

Massage therapy

• Reduces anxiety and provides symptom relief.
• Safe when performed by trained oncology massage therapists.
• Should be avoided directly over areas of known tumor or recent surgery.

📊 Illustration 17.10 — Integrative Therapies Evidence Summary (traffic light format: green = good evidence, yellow = emerging/mixed, red = insufficient)

Part 8: Cultural Dietary Considerations

Healthy eating principles can be adapted to any cultural food tradition. The goal is not to abandon the foods you love, but to adjust preparation methods and proportions:

• Middle Eastern cuisine: Already Mediterranean-adjacent. Emphasize olive oil, legumes (hummus, falafel, lentil soup), vegetables, and fish. Limit lamb fat and large portions of white rice.
• South Asian cuisine: Rich in spices with potential anti-inflammatory properties (turmeric, cumin). Emphasize lentils (dal), vegetables, and yogurt. Limit ghee and deep-fried preparations.
• African American cuisine: Emphasize greens (collards, kale), beans, sweet potatoes, and baked or grilled fish. Limit fried foods, processed meats, and sugary beverages. Higher diet quality, as represented by a Mediterranean-style diet, may reduce the odds of high aggressive prostate cancer similarly in both African American and European American men.²⁵
• Latin American cuisine: Emphasize beans, avocado, fresh salsa, grilled fish, and corn tortillas. Limit processed meats, fried foods, and refined carbohydrates.
• East Asian cuisine: Naturally rich in soy, green tea, fish, and vegetables. Limit sodium (soy sauce), white rice portions, and processed foods.

The key message: no culture's food tradition is inherently "bad." Every cuisine has healthy foundations — the goal is to build on those strengths while reducing processed foods, excess sugar, and unhealthy fats.

Part 9: Partner and Caregiver Involvement

Lifestyle changes are more sustainable when your partner or family participates. The CHALLENGE trial included behavior-support sessions that helped patients maintain exercise habits over 3 years.¹ Research consistently shows that social support is one of the strongest predictors of long-term behavior change.

Practical tips:

• Cook together — make meal preparation a shared activity, not a chore.
• Walk together — even 20 minutes after dinner counts.
• Set shared goals — "We will eat Mediterranean meals 5 nights this week."
• Celebrate milestones — acknowledge progress, not just perfection.
• Join a support group together — many prostate cancer support groups welcome partners.
• Be patient with setbacks — changing lifelong habits takes time. A bad week does not erase a good month.

Part 10: Practical Tools

Sample 7-day Mediterranean meal plan (designed for a man on ADT)

Monday

• Breakfast: Greek yogurt with berries and walnuts
• Lunch: Lentil soup with whole grain bread
• Dinner: Grilled salmon with roasted vegetables and quinoa
• Snack: Apple with almond butter

Tuesday

• Breakfast: Oatmeal with flaxseed and banana
• Lunch: Mediterranean salad (chickpeas, cucumber, tomato, feta, olive oil dressing)
• Dinner: Chicken breast with steamed broccoli and brown rice
• Snack: Handful of mixed nuts

Wednesday

• Breakfast: Whole grain toast with avocado and a poached egg
• Lunch: Tuna salad (olive oil, not mayo) with mixed greens
• Dinner: Baked white fish with roasted sweet potatoes and green beans
• Snack: Hummus with carrot and celery sticks

Thursday

• Breakfast: Smoothie (spinach, banana, berries, Greek yogurt, flaxseed)
• Lunch: Bean and vegetable soup with a small whole grain roll
• Dinner: Grilled chicken with tabbouleh and roasted eggplant
• Snack: Orange and a few walnuts

Friday

• Breakfast: Scrambled eggs with tomatoes and spinach
• Lunch: Whole wheat pita with falafel, tahini, and salad
• Dinner: Shrimp stir-fry with vegetables over brown rice (use olive oil)
• Snack: Pear with a small piece of dark chocolate

Saturday

• Breakfast: Whole grain pancakes with fresh berries
• Lunch: Grilled vegetable and mozzarella sandwich on whole grain bread
• Dinner: Baked cod with lemon, capers, roasted asparagus, and couscous
• Snack: Trail mix (nuts, seeds, dried cranberries)

Sunday

• Breakfast: Veggie omelet with mushrooms, peppers, and onions
• Lunch: Minestrone soup with a side salad
• Dinner: Lean lamb kebabs with grilled vegetables and hummus
• Snack: Greek yogurt with honey and pistachios

Notes on this meal plan:

• Protein is included at every meal to help preserve muscle during ADT.
• Calcium-rich foods (yogurt, leafy greens, fish with bones) appear daily for bone health.
• Lycopene sources (tomatoes, watermelon) are included several times per week.
• Cruciferous vegetables (broccoli, cauliflower, kale) appear regularly.
• Healthy fats come primarily from olive oil, nuts, avocado, and fish.
• This plan provides approximately 1,800–2,200 calories per day — adjust portions based on your weight goals and activity level.

During radiation therapy adjustments:

If you are experiencing bowel irritation during pelvic radiation, modify this plan by:

• Replacing whole grains with white rice, white bread, and white pasta
• Removing raw vegetables and replacing with well-cooked, peeled vegetables
• Avoiding beans and lentils temporarily
• Skipping spicy seasonings
• Replacing acidic fruits (oranges, tomatoes) with bananas, applesauce, and melon

Simple grocery shopping list

Produce: Spinach, kale, broccoli, tomatoes, sweet potatoes, carrots, celery, cucumbers, bell peppers, onions, garlic, avocados, bananas, berries, apples, lemons, oranges

Proteins: Salmon, cod or tilapia, chicken breast, eggs, canned tuna (in olive oil), shrimp, lean ground turkey

Pantry: Extra virgin olive oil, canned chickpeas, canned lentils, canned beans (black, white, kidney), whole grain pasta, brown rice, quinoa, oatmeal, whole grain bread, nuts (walnuts, almonds, pistachios), seeds (flaxseed, chia), natural peanut or almond butter, tomato sauce (no sugar added), low-sodium broth

Dairy/alternatives: Greek yogurt (plain, low-fat), feta cheese, mozzarella, milk or fortified plant milk

Spices: Turmeric, cumin, oregano, basil, black pepper, garlic powder, cinnamon

Exercise tracking log

Use a simple weekly log to track your progress. Write down what you did, for how long, and how you felt:

• Date:
• Type of exercise: (walking, cycling, resistance training, yoga, etc.)
• Duration: (minutes)
• Intensity: (light / moderate / vigorous)
• How I felt before: (1–5 scale: 1 = very tired, 5 = very energetic)
• How I felt after: (1–5 scale)
• Notes: (any symptoms, weather, mood, etc.)

Weekly goals:

• Aerobic: _____ minutes this week (target: 150 min moderate or 75 min vigorous)
• Resistance training: _____ sessions this week (target: 2–3)
• Stretching/balance: _____ sessions this week (target: 2–3)

Myth vs. Fact

Myth: "There is a specific anti-cancer diet that can cure prostate cancer."

Fact: No single food or diet cures cancer. However, an overall healthy eating pattern — particularly the Mediterranean diet — is associated with better outcomes when combined with standard treatment.⁸ ⁹

Myth: "If I exercise during treatment, I will be too tired."

Fact: The opposite is true. Exercise is one of the most effective treatments for cancer-related fatigue. Multiple studies show that patients who exercise during treatment have less fatigue, not more.¹ ⁶

Myth: "Supplements can replace a healthy diet."

Fact: Most large trials of individual supplements (selenium, vitamin E, high-dose zinc) have shown no benefit or even harm. Nutrients from whole foods work differently — and better — than isolated supplements in pills.

Myth: "I should fast during chemotherapy to starve the cancer."

Fact: While intermittent fasting is an active area of research, there is currently insufficient evidence to recommend it during cancer treatment. Fasting during chemotherapy risks muscle loss and malnutrition. Do not fast without discussing it with your oncologist.

Myth: "Men with bone metastases should not exercise."

Fact: With appropriate precautions and physician guidance, exercise is safe and beneficial even for men with bone metastases. Supervised programs can be tailored to avoid stress on affected bones while maintaining fitness and quality of life.⁶

Questions to Ask Your Doctor

1. Should I see a registered dietitian who specializes in cancer nutrition?
2. Are there specific dietary changes I should make during my treatment (radiation, ADT, chemotherapy)?
3. How much exercise is safe for me right now, given my treatment and overall health?
4. Do I need calcium and vitamin D supplements, especially if I am on hormone therapy?
5. Is my weight affecting my cancer treatment or prognosis?
6. Are there any foods or supplements I should avoid during my specific treatment?
7. Can you refer me to an exercise program or physical therapist experienced with cancer patients?
8. Should I try intermittent fasting, or is it too early to recommend?
9. Are there any clinical trials studying diet or exercise in prostate cancer that I might be eligible for?
10. How can my partner or family best support my lifestyle changes?

Key Takeaways

1. Exercise is medicine. The CHALLENGE trial proved that structured exercise improves cancer survival. Aim for at least 150 minutes of moderate activity per week plus 2–3 resistance training sessions. Start small if needed — even 10 minutes of walking matters.
2. The Mediterranean diet has the strongest evidence. Rich in vegetables, fruits, fish, legumes, olive oil, and whole grains, it is consistently associated with better prostate cancer outcomes. It is not a temporary diet — it is a lifelong eating pattern.
3. Adapt your nutrition to your treatment. Low-residue eating during radiation, high-protein intake during ADT, and small frequent meals during chemotherapy can help manage side effects.
4. Weight management matters. Obesity is linked to worse prostate cancer outcomes. ADT makes weight control harder — which makes diet and exercise even more important during hormone therapy.
5. Integrative therapies can help. Yoga, acupuncture, and mindfulness have evidence supporting their use for managing treatment side effects — but they complement standard treatment, never replace it.
6. Supplements are not substitutes. Whole foods outperform pills. High-dose supplements (zinc, selenium, vitamin E) have shown no benefit or potential harm in large trials.
7. You are not alone. Involve your partner, join a support group, and ask your doctor for referrals to dietitians and exercise specialists. Lifestyle changes are easier — and more sustainable — with support.

Support Resources

• American Cancer Society — Nutrition and Physical Activity: cancer.org/healthy — free guides on eating well and staying active during and after cancer treatment
• YMCA LIVESTRONG Program: ymca.org/livestrong — free 12-week exercise program for cancer survivors at participating YMCA locations
• American Institute for Cancer Research (AICR): aicr.org — evidence-based dietary recommendations for cancer prevention and survivorship
• Academy of Nutrition and Dietetics — Find an Expert: eatright.org — search for a registered dietitian specializing in oncology nutrition
• ACSM Exercise is Medicine: exerciseismedicine.org — resources for finding certified cancer exercise trainers
• Prostate Cancer Foundation — Lifestyle Resources: pcf.org — diet and exercise guides specifically for prostate cancer patients
• CancerCare — Nutrition Counseling: cancercare.org — free professional nutrition counseling for cancer patients
• National Cancer Institute — Eating Hints: cancer.gov/publications — free booklet on managing eating problems during treatment

Chapter References

References

1. Courneya KS, et al. Effects of exercise on disease-free and overall survival in colon cancer: the CHALLENGE trial. JAMA. 2025.
2. Courneya KS, et al. Cost-effectiveness analysis of the CHALLENGE trial. JAMA. 2025.
3. Friedenreich CM, et al. Physical activity and cancer outcomes: a precision medicine approach. Clin Cancer Res. 2024.
4. Skolarus TA, et al. American Cancer Society prostate cancer survivorship care guidelines. CA Cancer J Clin. 2014.
5. Patel AV, et al. American Cancer Society guideline concordance and mortality in prostate cancer survivors. JAMA Netw Open. 2024.
6. Kenfield SA, et al. Physical activity and survival after prostate cancer diagnosis. J Clin Oncol. 2011; and related pooled analyses.
7. Trudel-Fitzgerald C, et al. Post-diagnosis physical activity, diet, and mortality in prostate cancer. Health Professionals Follow-up Study. 2025.
8. Loeb S, et al. Dietary patterns and prostate cancer outcomes: a systematic review. Eur Urol. 2025.
9. Greenberg D, et al. Diet, lifestyle, and prostate cancer mortality: a systematic review. J Urol. 2026.
10. Tabung FK, et al. Mediterranean diet and Gleason grade progression in active surveillance. Cancer. 2023.
11. Castelló A, et al. Mediterranean dietary pattern and aggressive prostate cancer risk. Prostate. 2018.
12. Petimar J, et al. Post-diagnosis diet quality and mortality in prostate cancer. Health Professionals Follow-up Study. 2026.
13. Morze J, et al. Mediterranean diet and cancer survival: a meta-analysis. Eur J Nutr. 2022.
14. Schwingshackl L, et al. Mediterranean diet and cancer risk: a meta-analysis. BMC Med. 2017.
15. Schwingshackl L, et al. Adherence to Mediterranean diet and risk of cancer: an updated meta-analysis. Nutrients. 2017.
16. Loeb S. Diet and prostate cancer: a promising side dish. Cancer Epidemiol Biomarkers Prev. 2025.
17. Hojman P, et al. Molecular mechanisms linking exercise to cancer prevention and treatment. Cell Metab. 2018.
18. Milbury K, et al. Mind-body interventions for cancer patients. Semin Radiat Oncol. 2026.
19. Ben-Josef AM, et al. Yoga for prostate cancer survivors: a systematic review. Support Care Cancer. 2022.
20. Ben-Josef AM, et al. Yoga during radiation therapy for prostate cancer: a phase II trial. Int J Radiat Oncol Biol Phys. 2017.
21. Flores SA, et al. Yoga before radical prostatectomy: a pilot RCT. Integr Cancer Ther. 2023.
22. Lyman GH, et al. ASCO-SIO guideline update on integrative approaches for fatigue. J Clin Oncol. 2024.
23. He Y, et al. Acupuncture for cancer symptoms: an overview of systematic reviews. Acupunct Med. 2020.
24. Hershman DL, et al. MPOWER trial: acupuncture for ADT-related hot flashes. Pilot RCT. 2026.
25. Freedland SJ, et al. Mediterranean diet and aggressive prostate cancer by race. Prostate Cancer Prostatic Dis. 2021.