High-fiber diet may 'rejuvenate' immune cells that fight cancer, study finds

Researchers discovered that a high-fiber diet may help immune cells fight cancer more effectively by boosting gut bacteria that produce beneficial chemicals. When mice with melanoma ate fiber-rich foods, their gut microbes produced more short-chain fatty acids, particularly butyrate, which rejuvenated tired cancer-fighting T cells. These mice stayed tumor-free longer and developed smaller tumors compared to those on low-fiber diets.