Wheat bran comes from the outer layer of the wheat seed and is removed during the processing of wheat flour. This ingredient is very high in fiber.
Given that wheat bran is very high in fiber, it acts as many other fibrous foods do, by slowing the time food travels through the gut, increasing the feeling of fullness, and slowing the absorption of nutrients into the blood stream. Supplementation with wheat bran has been found to improve constipation. Wheat bran intake can worsen symptoms of irritable bowel syndrome.
Wheat bran is likely unsuitable for individuals sensitive to gluten.
See: Wheat. High fiber cereals and bars.