Several lifestyle factors can meaningfully lower your risk of prostate cancer, with the strongest evidence pointing to diet, exercise, and weight management. Some of these changes carry surprisingly large risk reductions, while a few popular “prevention” supplements actually do more harm than good.
Cooked Tomatoes Offer Strong Protection
Lycopene, the compound that gives tomatoes their red color, is one of the best-studied nutrients for prostate cancer prevention. Six major studies support a 30% to 40% reduction in prostate cancer risk among men who eat the most tomato products. The key detail: cooking matters. Your body absorbs lycopene far more efficiently from cooked tomato products like pasta sauce, tomato soup, and stewed tomatoes than from raw tomatoes.
In a large prospective study published in the Journal of the National Cancer Institute, men who ate two or more servings of tomato sauce per week had a 23% lower risk of prostate cancer compared to men who rarely ate it. The protection was even more striking for aggressive cancers that spread beyond the prostate, where risk dropped by 35%. Even one serving per week showed a measurable 20% reduction. This is one of the simplest dietary changes you can make, and the evidence behind it is robust.
Load Up on Cruciferous Vegetables
Broccoli, cauliflower, Brussels sprouts, kale, and cabbage all contain a compound called sulforaphane that interferes with cancer cell growth in the prostate. Multiple epidemiological studies have found that men who eat these vegetables regularly have a lower risk of prostate cancer, though pinning down exact percentages is harder than with tomatoes because intake varies so widely across studies. The mechanism is well understood at the cellular level: sulforaphane disrupts the signaling pathways that prostate cancer cells rely on to grow.
Aim for several servings per week. Lightly steaming cruciferous vegetables preserves more of the beneficial compounds than boiling, which leaches them into the water.
Soy Foods Provide a Modest Benefit
A large meta-analysis in Frontiers in Nutrition found that men who regularly consume soy products have about a 12% lower risk of prostate cancer. The dose-response data suggests each 25 grams per day of soy intake is associated with a 6% reduction. Tofu, edamame, tempeh, and miso are practical sources. This may partly explain why prostate cancer rates are historically lower in East Asian countries where soy consumption is high. The benefit is real but moderate, so think of soy as one piece of a larger dietary pattern rather than a standalone fix.
Exercise Hard, Especially After 65
Physical activity reduces prostate cancer risk, but intensity matters more than duration. A study highlighted by Harvard Health found that men aged 65 and older who engaged in at least three hours of vigorous physical activity per week reduced their risk of being diagnosed with high-grade, advanced, or fatal prostate cancer by nearly 70%. That’s one of the largest risk reductions seen for any lifestyle factor.
Vigorous activity means exercise that raises your heart rate significantly: jogging, cycling, swimming laps, or playing tennis. Walking, while good for general health, doesn’t appear to offer the same degree of protection against aggressive prostate cancer. Interestingly, the same study found that vigorous exercise did not show the same protective effect in men younger than 65, suggesting the benefit may relate to how exercise affects hormone levels and inflammation as men age.
Keep Your Weight in Check
Carrying excess weight, particularly around the midsection, is consistently linked to more aggressive forms of prostate cancer. Research from the American Association for Cancer Research found that obese men had roughly 1.5 times the odds of developing highly aggressive prostate cancer compared to men at a normal weight. For severely obese men, that risk nearly doubled. A high waist-to-hip ratio (above 0.98) independently increased the risk of aggressive disease by about 42%, regardless of overall weight.
The pattern held across racial groups, though the magnitude differed. The connection between excess body fat and prostate cancer aggressiveness likely involves hormonal changes: fat tissue alters levels of insulin, estrogen, and inflammatory molecules that can fuel cancer growth. Even modest weight loss that reduces your waist circumference can shift these markers in the right direction.
Cut Back on Red and Processed Meat
Men who eat about five servings per week of red or processed meat (a serving is roughly 3 ounces) have a 10% to 20% higher risk of dying prematurely from all causes after a prostate cancer diagnosis, according to American Cancer Society data. Each additional daily serving of red or processed meat is associated with a 17% increased risk of death from all causes and a 19% increased risk of cardiovascular death. Replacing red meat with poultry or plant-based protein sources is a practical swap. You don’t need to eliminate red meat entirely, but keeping it to two or three modest servings per week aligns with the patterns seen in lower-risk populations.
Watch Your Calcium Intake
Calcium is essential for bone health, but very high intakes may raise prostate cancer risk. Data from a large National Cancer Institute screening trial found that men consuming more than 2,000 milligrams of calcium per day had a 34% higher risk of prostate cancer compared to men consuming less than 1,000 milligrams. The association was strongest for nonaggressive disease. Most men get around 1,000 milligrams daily from food, which appears to be a safe range. The risk climbs when you stack high-dairy diets on top of calcium supplements. If you’re already eating cheese, yogurt, and milk regularly, adding a calcium supplement may push your intake past the point of benefit.
Green Tea in Large Quantities May Help
Green tea contains compounds called catechins that have shown anti-cancer properties in laboratory studies. A systematic review and meta-analysis found that consuming more than seven cups of green tea per day was associated with a linearly reduced risk of prostate cancer. In clinical trials involving men with precancerous prostate changes, green tea catechins reduced the risk of progressing to cancer by 62% compared to placebo.
Seven cups a day is a lot of tea, typical in parts of Japan but uncommon in Western countries. Drinking three to five cups daily is a more realistic goal and still provides a meaningful dose of catechins. Green tea supplements exist, but the clinical trial data specifically used catechin extracts under medical supervision, and the safety profile of high-dose supplements over long periods is less clear.
Skip the Vitamin E and Selenium Supplements
This is where many men go wrong. The SELECT trial, one of the largest cancer prevention studies ever conducted with over 35,000 participants, tested whether vitamin E and selenium supplements could prevent prostate cancer. They didn’t. Vitamin E supplements actually increased prostate cancer diagnoses by 17%, translating to 11 additional cases per 1,000 men over seven years. The result was statistically significant and not attributable to chance.
The findings got worse with deeper analysis. Men who already had high selenium levels and then took selenium supplements nearly doubled their chance of developing high-grade prostate cancer. Men with low selenium who took vitamin E also doubled their risk of aggressive disease. The National Cancer Institute’s conclusion is unambiguous: men should not take vitamin E or selenium supplements for cancer prevention.
The Vitamin D Question Is Complicated
You might expect vitamin D to be protective, but the data tells a more nuanced story. A large nested case-control study found that men with the highest vitamin D blood levels actually had 40% to 60% higher risk of developing prostate cancer compared to men with low levels. This doesn’t necessarily mean vitamin D causes prostate cancer. Men with higher vitamin D levels may spend more time outdoors and get screened more often, leading to more diagnoses. But it does mean that taking high-dose vitamin D supplements specifically to prevent prostate cancer is not supported by current evidence. Maintaining normal vitamin D levels for bone and immune health is reasonable, but megadosing with prostate cancer prevention in mind is not backed by the science.