Eating oatmeal for dinner helps to lose weight. Oat is a kind of coarse grains, which is low in calories, fat and rich in crude fiber. Crude fiber will expand after entering the human body, which will make people feel full, suppress appetite, reduce the intake of other calorie foods and help the human body lose weight. Oatmeal also contains a lot of cellulose, which can promote intestinal peristalsis, promote human laxative and detoxification, and reduce weight gain caused by waste and toxin accumulation. Oats also contain essential amino acids and trace elements, which can accelerate human metabolism. The acceleration of human metabolism will take away some toxins and calories in human body, which is also helpful to lose weight. Because oatmeal contains ingredients that help people lose weight, eating oatmeal for dinner can help them lose weight.