There is growing interest in the relationship between dietary habits and cancer. Dietary fibers are a complex group of oligosaccharides, polysaccharides, resistant starch, and resistant dextrins. There is longstanding evidence that dietary fibers may reduce circulating estrogen levels through changes in the gut microbiome and increased excretion of estrogens in the gastrointestinal tract. Soluble fibers are believed to decrease intestinal cholesterol absorption, and there is emerging evidence that cholesterol byproducts may have estrogenic effects.1 Fiber intake would be an easily modifiable risk factor to reduce the development of breast cancer.

Until recently, there have been no studies showing a clear relationship between dietary fiber and breast cancer risk. In addition, there has been no significant evaluation of the short- and long-term impact of fiber intake during breast development in the adolescent years. However, in recent months, several new studies have suggested a protective effect of fiber in the risk...

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