Looks like we can add another disease to the list that dietary fiber can help tame. According to a study in the journal Cancer by investigators at the Harvard T.H. Chan School of Public Health, pre- and postmenopausal women who had the highest intake of dietary fiber (both soluble and insoluble) also had a fairly significant 8% lower risk of developing breast cancer, based on existing data from 20 observational studies. The mechanism could include everything from altering hormone levels to improving the microbiome—or it could simply be that high-fiber grub like legumes and vegetables tend to be awash in cancer-fighting nutrients.