There is no such thing as “three kinds of people should not eat oatmeal”. As long as you are not allergic to oatmeal, you can eat it in moderation. Oatmeal is made of oats as the main raw material of a food, is a staple food, its calorie is 338 calories / 100 grams (dry weight), if you add water to soak the calorie is about 120 calories / 100 grams, and cooked rice, cooked pasta calorie is about the same. Its nutrients are mainly carbohydrates, and its main task is to provide a sufficient amount of carbohydrates to provide energy support for a person’s work and study for a day. Oatmeal contains more fiber than flour and rice, which can promote intestinal peristalsis. It also does not contain gluten (gluten) and can be consumed by people with gluten allergies and celiac disease patients. In comparison, rice and flour contain some amount of gluten. It is best to choose oatmeal that is plain and not overly processed or added. Oatmeal should not be consumed by people who are allergic to oats.