The American Institute for Cancer Research and the World Cancer Research Fund estimate that 30-40 percent of all cancers can be prevented by a healthy diet and lifestyle!
Studies show that eating lots of fruits and veggies, especially cruciferous vegetables like Brussels sprouts and broccoli, can greatly reduce the risk of cancer by supplying tons of protective vitamins, minerals and antioxidants. Eating adequate amounts of fiber (women should aim for at least 25 grams per day and men should aim for at least 30 grams) and Omega 3 essential fatty acids, as well as reducing intake of processed meats, sugars and refined grains, were also found to be important factors in preventing cancer.
If you want to read more about the link between nutrition and cancer, check out this "Review of the Evidence for an Anti-Cancer Diet," published by Nutrition Journal: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC526387/
