Potassium is very healthy and reduces some of the harmful effects of sodium. Fortunately, fresh foods and legumes are high in potassium. Strawberries have been found good at preventing prostate cancer and probably any dark red or blue or purple fruit is high in anti-oxidants. Oranges have been found beneficial, too, lowering cholesterol. Cruciferous vegetables such as cabbage, Brussels sprouts, broccoli, and cauliflower have been found especially helpful.
Tomatoes are particularly good at preventing prostate cancer.
Greens have also been found very beneficial. Whole grain wheat and rye have been the best studied, but rolled oats, and brown rice have a few studies. Many studies have found refined grains, including white rice, to be harmful. Low salt nuts are readily available at no extra cost. Peanut oil is very good, too.