Women who ate two or more servings of peanuts per week had a decreased risk of colorectal cancer, according to a prospective research with certain limitations. Peanuts also contain chemicals that may be helpful in the prevention of cancer. Phytosterols, for example, have been proven in vitro and animal studies to inhibit the development of cancer cells in the breast, colon, and prostate. Phytosterols have been linked to a lower incidence of lung cancer in humans. As previously stated, peanuts contain resveratrol, an antioxidant that has the capacity to convert into piceatannol, an anti-cancer molecule. This change would be carried out by a specific enzyme found in malignant tumors. However, further research is needed to examine all of these peanut chemicals in terms of cancer prevention.