I read Fiber Fueled by Dr. Will Bulsiewicz, a gastroenterologist. He stated that eating fiber decreases the risk of developing breast cancer and colorectal cancer. These two cancers are among the most common, with breast cancer accounting for 25% of new cancer cases and colorectal cancer 12% of new cases.
The risk of breast cancer decreased by 8% for the group who ate the most fiber compared to the group that ate the least in this meta-analysis. A separate study showed that the recurrence of breast cancer decreased by 8% comparing the group who ate the most fiber to the group who ate the least.
One study I read showed that for every 8 grams of fiber that was consumed, the risk of getting colorectal cancer decreased by 8%. Another study showed that every five-gram increase in fiber (prior to diagnosis) resulted in 18 % lower risk of dying from colorectal cancer.
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