Which part of the grain is known for being high in fiber and vitamins?

The bran is the outer layer of the grain seed, and it is particularly known for its high content of fiber and various vitamins, especially B vitamins. This layer plays a crucial role in the nutritional profile of whole grains. Fiber is essential for digestive health, helping to maintain bowel regularity and prevent constipation. Additionally, the vitamins found in the bran contribute to overall health, supporting various bodily functions such as energy metabolism and immune function.

The endosperm, while rich in carbohydrates and some protein, contains a limited amount of fiber and is not as vitamin-rich as the bran. The germ is the part of the grain that has the potential to sprout into a new plant, and although it does contain some nutrients and healthy fats, it does not have the same level of fiber. The term "outer shell" typically refers to the husk, which is generally removed during processing and is not where fiber and vitamins are concentrated. Therefore, the bran is the most significant source of fiber and vitamins in the grain.