Wheat bran

The outer covering of whole wheat grain is known as wheat bran. It's a great source of prebiotics. It also has a unique fiber comprised of arabinoxylan oligosaccharides (AXOS). AXOS fiber from wheat bran has been found to increase the number of beneficial Bifidobacteria in the stomach.

In one research of healthy people, increased wheat bran consumption over three weeks resulted in an increase in Bifidobacteria counts when compared to a control group. Wheat bran has also been proven to help with digestive issues like gas, cramps, and abdominal pain. Grains high in AXOS have antioxidant and anticancer properties.