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Experts do not know the exact effect of diet on hereditary cancer risk. It is challenging to prove that specific foods affect cancer risk and research on diet and cancer risk is often inconclusive.Research shows that plant-based, high-fiber foods provide nutrients known as phytochemicals andantioxidants. These benefitial chemicals may protect cells and help repair DNA damage. Vegetables like broccoli, brussel sprouts, cauliflower and fruits and vegetables which are red, orange, or purple in color contain these compounds.
Researchers are looking at the effects of different foods and phytochemicals on cancer risk in high-risk people. So far, no single nutrient has been proven to lower cancer risk in people with hereditary mutations. The American Institute for Cancer Research (AICR) recommends meals that consist of two-thirds or more fruits, vegetables, beans and whole grains, and one-third or less lean protein. One study which observed women with BRCA mutations found those who ate a varied diet had a lower breast cancer risk.