Oat bran is a carbohydrate. Oat bran contains starch and dietary fiber, which can be used as a staple food for meal replacement. Many people also drink oat bran to lose weight, because its dietary fiber can promote intestinal peristalsis and play a laxative role. At the same time, oat bran is low in calories and can be used as meal replacement food to reduce calorie intake, thus achieving the effect of slimming.