Diet and Prostate Cancer: What the Evidence Actually Shows

By Mr Neil Haldar, Consultant Urological Surgeon
Last reviewed: August 2026

Key points

• No food, diet or supplement has been shown to cure prostate cancer.
• Maintaining a healthy weight is one of the most strongly supported nutritional and metabolic measures, particularly in relation to aggressive and advanced prostate cancer.
• A broadly Mediterranean pattern of eating — vegetables, fruit, pulses, wholegrains, nuts, olive oil and fish, with less processed food and processed meat — is a sensible approach for overall health, although it should not be regarded as a treatment for prostate cancer.
• No convincing evidence shows that tomatoes, broccoli, green tea, pomegranate, soy, or other individual foods can treat established prostate cancer.
• High-dose supplements marketed for “prostate health” are generally unnecessary. In a major randomised trial, vitamin E supplementation actually increased prostate cancer diagnoses.
• If you are receiving androgen deprivation therapy (hormone therapy), exercise, maintaining muscle mass, controlling weight and protecting cardiovascular and bone health become particularly important.
• Dietary changes should never replace appropriate PSA monitoring, MRI, biopsy, active surveillance or cancer treatment.

Few questions come up more often in my clinic than this one.

A man is told he has a raised PSA, a new diagnosis of prostate cancer, or that he is about to start hormone therapy — and within a few minutes he asks:

What should I be eating?

It is an entirely reasonable question.

Diet is one of the few things a man can control at a moment when almost everything else can feel as though it is being decided for him. Unfortunately, it is also an area surrounded by confident claims, miracle foods, supplements and commercially driven misinformation.

Search online, and you will rapidly encounter claims about tomatoes, broccoli, turmeric, green tea, pomegranate, selenium, vitamin E, dairy, red meat and dozens of supplements.

Some of these claims began with legitimate scientific observations.

That does not mean they have survived proper testing.

This article explains what the evidence genuinely supports, what it merely suggests, and — importantly — where popular prostate cancer advice has been tested in clinical trials and found not to work.

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First, an honest statement about diet and prostate cancer

Most of what we know about diet and prostate cancer comes from observational research.

Researchers study large groups of men, record what they eat and then follow them for years to see who develops prostate cancer, whose cancer progresses and who dies from it.

These studies are useful.

But they are much better at identifying associations than proving cause and effect.

There are several reasons for that.

Diet travels with everything else

Men who eat more vegetables often also exercise more, smoke less, drink less alcohol, weigh less and engage more with healthcare.

Researchers try to adjust statistically for those differences, but the adjustment can never be perfect.

An apparent protective effect of broccoli may partly reflect the fact that people who regularly eat broccoli tend to behave differently in many other ways.

Detection is not the same as disease

Prostate cancer has another complication.

Men who interact more frequently with healthcare are more likely to undergo PSA testing. More PSA testing means more prostate cancers are diagnosed — including small, slow-growing cancers that may never have caused harm.

A lifestyle factor can therefore appear to influence cancer risk when it is partly influencing the probability of diagnosis.

Prostate cancer is not one disease

A small, low-grade cancer confined to the prostate behaves very differently from an aggressive cancer that has spread beyond it.

Different biological factors may influence these cancers differently.

So whenever you read that a particular food “increases” or “reduces” prostate cancer risk, an important question is:

Which prostate cancer?

Overall prostate cancer incidence?

Aggressive disease?

Metastatic disease?

Death from prostate cancer?

Those are very different outcomes.

With that framing in mind, we can look at what the evidence actually tells us.

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Body weight matters more than any individual food

If I were advising a man where to concentrate his nutritional efforts, I would start with metabolic health rather than a particular food or nutrient.

Greater body fatness has one of the most consistent relationships with advanced and aggressive prostate cancer.

The World Cancer Research Fund has concluded that greater body fatness is probably a cause of advanced prostate cancer.

The relationship is not straightforward.

Obesity does not appear to have the same association with every form of prostate cancer. Some studies have found relatively little relationship with low-grade disease while showing a clearer association with high-grade disease, advanced disease and prostate cancer mortality.

There are several plausible explanations.

Excess visceral fat is metabolically active. It contributes to insulin resistance, changes circulating insulin and growth-factor signalling, affects sex-hormone metabolism and promotes chronic low-grade inflammation.

There may also be effects on diagnosis.

Men with obesity tend to have a larger circulating blood volume, which can result in a degree of PSA haemodilution. In other words, the same amount of PSA is distributed through a larger volume of blood.

Body weight also matters once treatment becomes necessary.

Obesity can make major pelvic surgery more technically demanding and may increase anaesthetic, metabolic and postoperative risks.

However, it is important not to overstate what we know.

The evidence linking obesity to aggressive prostate cancer is considerably stronger than the evidence proving that intentional weight loss after diagnosis directly reduces prostate cancer mortality.

Those are not the same scientific question.

The practical conclusion is nevertheless clear:

Achieving and maintaining a healthy weight is one of the best-supported nutritional and metabolic goals for men concerned about prostate cancer.

It also brings substantial benefits to cardiovascular health, diabetes risk, mobility, and general wellbeing, regardless of its direct effect on the cancer.

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Think about dietary patterns rather than “superfoods”

Nutritional research spent decades searching for individual substances that might prevent cancer.

Lycopene.

Selenium.

Vitamin E.

Omega-3 fats.

Isoflavones.

Antioxidants.

Again and again, promising observational or laboratory findings became much less impressive when subjected to better clinical testing.

That is one reason modern nutritional advice increasingly focuses on the overall eating pattern rather than a single molecule.

If I were recommending a general eating pattern to a man with prostate cancer, I would favour a broadly Mediterranean-style diet:

• plenty of vegetables and fruit;
• beans, lentils and other pulses;
• wholegrains;
• nuts and seeds;
• olive oil and other unsaturated fats;
• fish regularly;
• modest quantities of red meat;
• relatively little processed meat;
• and fewer ultra-processed foods, refined carbohydrates and excess calories.

There is some observational evidence linking healthier dietary patterns with favourable prostate cancer outcomes, but this should not be interpreted as proof that a Mediterranean diet treats prostate cancer.

However, there is a much broader reason to recommend it.

Men with prostate cancer still develop cardiovascular disease, diabetes and the other common diseases of later life. Those risks become particularly important in men receiving long-term hormone therapy.

Even if the direct prostate-cancer effect of a Mediterranean diet ultimately proved to be small, it would still be a sensible way to eat.

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Individual foods and prostate cancer

Dairy products and calcium

Dairy is one of the most frequently questioned food groups.

Some large observational studies have found an association between high dairy consumption or high calcium intake and an increased risk of prostate cancer.

However, the evidence is not strong enough to conclude that dairy causes prostate cancer. The World Cancer Research Fund currently describes the evidence relating higher dairy and calcium intake to prostate cancer as limited.

That distinction matters.

It would be inappropriate to tell men with prostate cancer simply to stop eating dairy.

Milk in tea, yoghurt and moderate amounts of cheese can all form part of a healthy diet.

I would avoid assuming that more calcium is always better.

Very high dairy consumption or high-dose calcium supplementation without a clinical reason is unlikely to offer benefit and may be undesirable.

There is an important exception.

Men receiving androgen deprivation therapy can lose bone density. They need adequate calcium and vitamin D, and in some patients specific supplements or bone-protective treatment are entirely appropriate.

So the practical advice is:

Moderate dairy rather than automatically eliminating it, and do not start high-dose calcium supplements without a reason.

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Red and processed meat

The relationship between red meat and prostate cancer is far less certain than its relationship with bowel cancer.

Some studies have suggested associations with processed meat or meat cooked repeatedly at very high temperatures, but prostate-specific evidence remains inconsistent.

I would therefore avoid alarmist advice about eliminating all red meat.

A sensible approach is to keep red meat moderate, make processed meats an occasional rather than everyday food, and get protein from a mix of fish, poultry, eggs, beans, lentils, nuts, soy, and other sources.

That recommendation is sensible for general health even if the direct effect on prostate cancer is uncertain.

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Tomatoes and lycopene

Tomatoes have probably acquired a stronger reputation in prostate cancer than any other food.

The reason is lycopene, the red carotenoid pigment found in tomatoes.

Early observational research suggested that men eating more tomato products might have lower rates of prostate cancer.

This led to enormous interest in lycopene supplements.

The subsequent evidence has been much less convincing.

No good evidence shows that lycopene supplements can treat prostate cancer, and current evidence does not justify prescribing tomatoes as an anti-cancer therapy.

There is nothing wrong with eating tomatoes.

Cooked tomato products such as passata, tinned tomatoes and tomato sauces provide readily absorbed lycopene and fit very well into a Mediterranean-style diet.

My advice is simple:

Eat tomatoes because they are a healthy food, not because you expect them to treat prostate cancer.

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Broccoli and other cruciferous vegetables

Broccoli, cabbage, cauliflower, Brussels sprouts and kale contain compounds called glucosinolates.

When metabolised, these produce substances including sulforaphane that have interesting biological effects in laboratory experiments.

That makes them scientifically interesting.

It does not make them cancer treatments.

Small human studies have explored cruciferous vegetables and concentrated sulforaphane preparations, but we do not have convincing evidence that eating broccoli or taking sulforaphane supplements changes clinically important prostate cancer outcomes.

They are nutritious vegetables and well worth eating.

Worth eating. Not worth medicalising.

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Soy foods

Soy attracted interest partly because some Asian populations with high soy consumption historically had lower prostate cancer mortality.

Soy contains isoflavones — compounds with weak oestrogen-like biological activity — and laboratory studies have suggested potentially interesting effects on prostate cells.

Human studies have produced some signals suggesting that soy consumption may be associated with a lower incidence of prostate cancer.

But evidence that soy slows established prostate cancer or reduces mortality is much weaker.

Whole soy foods such as tofu, edamame, tempeh and unsweetened soy milk are perfectly reasonable foods.

That does not mean men need concentrated isoflavone supplements.

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Fish and omega-3

Oily fish is a useful component of a healthy diet and has established nutritional and cardiovascular benefits.

The prostate cancer evidence is much less clear.

Over the years, studies of omega-3 fatty acids and prostate cancer have produced conflicting results, including some much-publicised findings that raised concerns about high circulating omega-3 levels.

The overall evidence has not established that eating oily fish causes prostate cancer, nor has it established that high-dose fish oil supplements prevent or treat it.

My practical advice is to eat fish as part of a balanced Mediterranean-style diet.

I would not recommend high-dose fish oil capsules for the purpose of treating or preventing prostate cancer.

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Coffee, green tea and alcohol

Coffee has been associated in several observational studies with a lower risk of lethal prostate cancer.

That is interesting, but it is not a reason for somebody who dislikes coffee to start drinking it as a treatment.

If you already enjoy coffee in moderation, there is no good prostate-cancer reason to stop.

Green tea has attracted similar attention because of compounds called catechins.

Laboratory work and some early clinical studies are interesting, but there is no convincing evidence that drinking green tea treats established prostate cancer.

Alcohol is different because its adverse effects extend well beyond prostate cancer.

The prostate-specific evidence is less clear than for several other cancers, although heavier intake has been associated in some research with poorer outcomes.

For most men, standard UK guidance remains sensible:

Do not regularly exceed 14 units of alcohol per week, and spread those units across several days rather than concentrating them into one or two sessions.

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Supplements: where promising theories have sometimes caused harm

This may be the most important part of the article.

The supplement industry is full of products marketed around phrases such as:

“prostate support”

“male health”

“antioxidant protection”

“immune support”

and “natural cancer defence”.

Natural does not mean effective.

And it certainly does not mean harmless.

Vitamin E

Vitamin E provides one of the clearest warnings in nutritional cancer research.

The SELECT trial enrolled more than 35,000 men and randomly allocated them to vitamin E, selenium, both or placebo.

The original hope was that these antioxidant supplements might prevent prostate cancer.

They did not.

With extended follow-up, men allocated to vitamin E alone had a statistically significant 17% higher relative incidence of prostate cancer than men receiving placebo.

This was precisely the opposite of what the biological theory had predicted.

High-dose vitamin E supplementation should therefore not be used to try to prevent prostate cancer.

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Selenium

Selenium was tested in the same SELECT trial.

It did not prevent prostate cancer.

Subsequent analyses have also raised concerns about supplementation in men with adequate selenium status.

There is no reason for men to take selenium supplements specifically to prevent or treat prostate cancer.

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Zinc

The prostate normally contains relatively high concentrations of zinc, which helped create a market for zinc-containing “prostate” supplements.

But biological plausibility does not prove clinical benefit.

Observational research has raised concerns about prolonged high-dose zinc supplementation, and there is no good evidence that taking extra zinc prevents or treats prostate cancer.

Normal dietary zinc is not a problem.

The concern is unnecessary high-dose supplementation.

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Beta-carotene

Beta-carotene is another antioxidant that once looked promising.

Large cancer-prevention trials in other settings showed that antioxidant supplementation can have unexpected harmful effects, particularly in smokers.

There is no evidence-based role for taking beta-carotene supplements to prevent prostate cancer.

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Vitamin D

Vitamin D needs a more nuanced discussion.

Vitamin D deficiency is common in the UK, particularly during winter and in some population groups.

Correcting genuine deficiency is sensible.

Vitamin D also matters for bone health, particularly in men receiving long-term hormone therapy.

But this is different from claiming that high-dose vitamin D treats prostate cancer.

There is no convincing evidence that taking large doses of vitamin D prevents prostate cancer or slows established cancer.

Take vitamin D for an appropriate nutritional or medical reason — not as an unproven cancer treatment.

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Pomegranate

Pomegranate attracted considerable interest after early studies suggested that pomegranate juice might slow the rate at which PSA rose after prostate cancer treatment.

That led to widespread marketing.

More rigorous controlled studies were much less impressive.

There is no good evidence that pomegranate juice or supplements should be used as treatment for prostate cancer.

Eat pomegranate if you enjoy it.

Do not mistake it for therapy.

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Saw palmetto

Saw palmetto is frequently marketed for “prostate health”, although most of the research has actually related to benign prostate enlargement rather than prostate cancer.

Well-conducted studies have not shown a convincing benefit, even for many of the urinary symptoms for which it is promoted.

It has no established role in the treatment of prostate cancer.

Importantly, tell your doctor about herbal products and supplements you take.

“Natural” products can still cause side effects or interact with medicines.

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Should men with prostate cancer take supplements?

My general rule is:

Do not take concentrated supplements in the hope of treating prostate cancer unless there is a specific medical or nutritional indication.

That is different from saying that nobody should take supplements.

Vitamin D may be appropriate.

Calcium may be required in selected men receiving hormone therapy.

Iron, vitamin B12 or other nutrients may be prescribed for genuine deficiencies.

The key distinction is between correcting a deficiency and taking large doses of a nutrient because somebody claims it fights prostate cancer.

If you are taking vitamins, herbal preparations or supplements bought online, tell your urologist or oncologist what they are.

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Diet after a prostate cancer diagnosis

The priorities change depending on where you are in your treatment.

If you are on active surveillance

Men on active surveillance are often particularly motivated to change their diet.

That is understandable.

Surveillance can sometimes feel psychologically like “doing nothing”, even though it is actually a structured treatment strategy involving PSA testing, MRI and repeat biopsy where appropriate.

It is worth knowing that intensive dietary change has been tested.

The MEAL randomised clinical trial studied men with early-stage prostate cancer on active surveillance. A telephone counselling intervention successfully persuaded men to substantially increase their vegetable intake.

But after two years, it did not significantly reduce prostate cancer progression compared with the control group.

That finding should not discourage healthy eating.

It should help us be precise about what healthy eating can and cannot do.

A good diet can:

• help maintain a healthy weight;
• reduce cardiovascular and metabolic risk;
• support general health;
• and help keep you physically fit if treatment becomes necessary.

But diet is not a substitute for active surveillance.

If you are on surveillance, continue the PSA tests, MRI scans and biopsies recommended by your treating team.

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After robotic prostatectomy

Around the time of prostate cancer surgery, dietary priorities become very practical.

Your body needs adequate energy and protein for recovery and wound healing.

Good hydration is important.

Constipation is common after surgery because of reduced activity, changes in diet and the effects of painkillers. Adequate fluid and a gradual return to normal dietary fibre can help.

Some men find that excessive caffeine or alcohol aggravates urinary urgency during the early stages of continence recovery, so moderation may be helpful.

For a detailed guide to the operation and recovery, see my information on robotic prostatectomy and recovery after robotic prostate surgery.

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During radiotherapy

Pelvic radiotherapy can cause temporary bowel symptoms in some men.

The right dietary response depends on the type and severity of those symptoms.

During a significant flare, some patients may benefit from temporarily changing the type or amount of fibre they eat, but avoid long-term, unnecessary dietary restriction.

If bowel problems become troublesome, ask your oncology team about specialist dietetic advice rather than trying increasingly restrictive diets yourself.

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Diet and exercise during hormone therapy

This is the situation in which lifestyle intervention becomes particularly important.

Androgen deprivation therapy — often simply called hormone therapy or ADT — is a highly effective part of prostate cancer treatment.

But testosterone affects the whole body.

Reducing it can cause:

• loss of muscle mass and strength;
• an increase in body fat;
• weight gain;
• insulin resistance;
• changes in cholesterol;
• fatigue;
• and accelerated loss of bone density.

Changes in body composition are particularly important.

Men may gain fat while simultaneously losing lean muscle. Systematic research has demonstrated both effects during ADT.

This is one reason I think men starting long-term hormone therapy should receive lifestyle advice at the beginning of treatment rather than after problems develop.

My priorities during ADT

Include protein regularly

Include an appropriate protein source with meals to help support muscle maintenance.

Examples include fish, poultry, eggs, yoghurt, pulses, beans, lentils, tofu and other soy foods.

Men with kidney disease or other medical conditions may need individual advice from a dietitian or doctor.

Make resistance exercise part of treatment

Exercise during ADT should not be regarded as an optional wellness extra.

NICE recommends supervised resistance and aerobic exercise at least twice a week for 12 weeks for men starting or receiving androgen deprivation therapy, to improve fatigue and quality of life.

European urology guidance similarly strongly recommends supervised combined resistance and aerobic training.

Resistance exercise is particularly important because it directly challenges the tendency to lose muscle.

The programme needs to be adapted to the individual, particularly in men who are frail, have significant cardiovascular disease, bone problems or cancer involving the skeleton.

Protect bone health

Men receiving long-term ADT may require assessment of fracture risk and bone mineral density.

Calcium and vitamin D intake should be adequate.

Some men will need specific bone-protective medication.

This is precisely why a blanket instruction to “avoid dairy” or “never take calcium” is inappropriate.

Monitor cardiovascular and metabolic health

Blood pressure, blood glucose and cholesterol deserve active attention during long-term hormone treatment.

The cardiovascular and metabolic consequences of ADT are clinically important.

A good cancer treatment plan should therefore consider the whole patient rather than the prostate alone.

Prevent weight gain rather than chasing it later

Weight and body-composition changes can start early during ADT.

Healthy eating and regular activity are much easier to establish at the start of treatment than after substantial changes have occurred.

If you are starting long-term hormone therapy and have not discussed exercise, weight, cardiovascular risk or bone protection, ask your treating team about them.

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Exercise may matter more than any individual food

If there is one lifestyle message I would place alongside healthy weight, it is physical activity.

Observational studies have repeatedly linked higher levels of physical activity with better outcomes among men with prostate cancer.

Those studies cannot prove that exercise itself caused the difference.

But exercise has another major advantage over most proposed dietary interventions:

We know it improves many outcomes that matter whether or not it directly alters the cancer.

Exercise can improve:

• cardiovascular fitness;
• insulin sensitivity;
• weight control;
• muscle strength;
• bone health;
• fatigue;
• physical function;
• and quality of life.

During androgen deprivation therapy, clinical guidelines specifically recommend combined aerobic and resistance exercise.

If you have limited energy for lifestyle change, I would prioritise becoming more physically active over searching for the perfect prostate-cancer food.

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What I actually advise men in clinic

Stripped of all the nutritional complexity, my advice is fairly simple.

1. Aim for a healthy weight and waistline. Greater body fatness has one of the strongest nutritional and metabolic associations with advanced prostate cancer.
2. Eat a broadly Mediterranean-style diet. Vegetables, fruit, pulses, wholegrains, nuts, olive oil, and fish should make up much of the diet. Keep processed foods, processed meat and excess calories relatively low.
3. Don’t obsess over individual “anti-cancer” foods. Tomatoes, broccoli, soy and green tea can all be part of a healthy diet, but none is a treatment for prostate cancer.
4. Moderate dairy rather than eliminating it automatically. Men on hormone therapy in particular need to think about bone health.
5. Avoid high-dose supplements marketed for prostate cancer prevention or treatment unless there is a genuine medical indication. Vitamin E and selenium are especially important examples of interventions that failed when properly tested.
6. Exercise regularly and include resistance training. This is particularly important during androgen deprivation therapy.
7. Keep alcohol within recommended limits and do not smoke.
8. Do not allow dietary change to replace proper prostate cancer care. PSA monitoring, MRI, biopsy, surgery, radiotherapy, hormone therapy and other treatments are recommended for a reason.

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Frequently asked questions

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A final word

I understand why men want diet to be more powerful than the evidence tells us it is.

The idea that the right combination of foods might control a cancer is understandably attractive — particularly when the alternatives involve surveillance, surgery, radiotherapy or hormone treatment.

Unfortunately, there is also no shortage of people willing to sell that idea.

The evidence gives us a more modest message.

Diet will not cure prostate cancer, and no individual food or supplement has been shown to do so.

But that does not make lifestyle irrelevant.

Your weight and metabolic health are associated with the risk of aggressive prostate cancer. Your nutritional status affects how well you tolerate treatment and recover. Exercise and diet can reduce some of the adverse effects of hormone therapy. And your cardiovascular and metabolic health remain enormously important throughout prostate cancer survivorship.

Those are genuinely worthwhile things to influence.

They usually require sustained, unglamorous changes in how you eat and how you move.

Not a jar of capsules.

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Concerned about a raised PSA or prostate cancer?

If you have a raised PSA, have recently been diagnosed with prostate cancer, are considering treatment, or would like a second opinion, I would be happy to review your individual situation.

I regularly help men understand their PSA, MRI and biopsy findings and weigh up options including active surveillance, robotic prostatectomy, radiotherapy and hormone therapy.

You may also find these guides useful:

• What to do if your PSA is elevated
• Prostate cancer: diagnosis and treatment options
• Robotic prostatectomy
• Recovery after robotic prostate surgery
• Prostate biopsy: procedure, results and recovery

Private consultations are available in Buckinghamshire, Berkshire and London, including The Chiltern Hospital in Great Missenden, The Clementine Churchill Hospital in Harrow and GenesisCare Windsor.

To arrange a consultation or second opinion, contact Mr Haldar’s private practice through the website or call 07841 048975.

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About Mr Neil Haldar

Mr Neil Haldar is a Consultant Urological Surgeon specialising in prostate cancer and robotic and laparoscopic uro-oncology.

He has more than 20 years’ experience as a consultant and has performed more than 1,000 radical prostatectomies. He established the da Vinci robotic prostatectomy programme at Buckinghamshire Healthcare NHS Trust and provides private prostate cancer consultations, treatment and second opinions across Buckinghamshire, Berkshire, Oxfordshire, West Hertfordshire and London.

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Evidence and further reading

World Cancer Research Fund International. Diet, Nutrition, Physical Activity and Prostate Cancer. Continuous Update Project / Third Expert Report.

European Association of Urology. EAU-EANM-ESTRO-ESUR-ISUP-SIOG Guidelines on Prostate Cancer, 2026.

National Institute for Health and Care Excellence. Prostate cancer: diagnosis and management (NG131).

Klein EA, Thompson IM Jr, Tangen CM, et al. Vitamin E and the Risk of Prostate Cancer: The Selenium and Vitamin E Cancer Prevention Trial (SELECT). JAMA. 2011.

Parsons JK, Zahrieh D, Mohler JL, et al. Effect of a Behavioral Intervention to Increase Vegetable Consumption on Cancer Progression Among Men With Early-Stage Prostate Cancer: The MEAL Randomized Clinical Trial. JAMA. 2020;323(2):140–148.

Haseen F, Murray LJ, Cardwell CR, O’Sullivan JM, Cantwell MM. The effect of androgen deprivation therapy on body composition in men with prostate cancer: systematic review and meta-analysis. Journal of Cancer Survivorship. 2010;4:128–139.

Prostate Cancer UK. Diet, physical activity and living with prostate cancer.

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This article is intended for general information and does not constitute individual medical advice. Dietary requirements can vary depending on your health, cancer treatment, and medications. Discuss significant dietary changes or supplements with your urologist, oncologist, GP or dietitian.