Nutrition tips to help prevent prostate cancer - Eat foods such as tomatoes, watermelon, guava, apricot and pink grapefruit which have an antioxidant, lycopene. Foods rich in Vitamin D such as fatty fish, soy milk, egg yolks, beef liver and don’t forget about sunlight. Omega - 3 fatty acids also found in fish such as salmon, mackerel and krill oil. Green Tea Diet rich in fruits and vegetables