The nutritional benefits of wheat bran are mainly undisputed. For a time, it was thought that it might fight cancer, but this remains largely unproven. However, a cup (58 g) of wheat bran does offer significant nutritional pluses. One cup contains 99% of the US recommended daily allowance (RDA) of fiber, nine grams of protein, and 34% of the RDA for iron. It is also high in protein, magnesium, manganese, niacin, phosphorus, zinc and vitamin B6, and is low in fat, with no cholesterol, and no sugar or sodium.