According to a scientific review published by the American Cancer Society, high fiber intake can reduce the chance of breast cancer. Researchers compared kinds of fiber intake and fiber consumption with breast cancer incidence rates.
People who consumed a high amount of fiber had an 8% reduced risk for premenopausal and postmenopausal cancers in comparison to people who consumed the smallest amount of fiber. Soluble fiber from cereals, legumes, fruit, and vegetables showed the strongest association with reduced risk, with the strongest associations observed in fruit fiber.
Various possible mechanisms that can reduce the risk include improved blood sugar control and insulin sensitivity, increased levels of sex hormone-binding globulin, and improved composition of intestinal microbiota.
The authors noted that high-fiber diets are related to increased intakes of vitamins, minerals, phytochemicals, and other compounds with protective effects against cancer. These results support the American Cancer Society’s dietary guidelines to consume fruits, vegetables, whole grains, and other high-fiber foods to scale back the danger of cancer.
Farvid MS, Spence ND, Holmes MD, Barnett JB. Fiber Consumption and breast cancer incidence: A systematic review and meta-analysis of prospective studies. Cancer. Published online April 6, 2020.