Drinking oat milk in moderation is not harmful, but overdrinking can cause indigestion or obesity and other problems. Oat milk is “oats + water” made of cereal drinks, nutrient-rich, per 100 ml of oat milk contains 45 calories, of which 8.1 grams of carbohydrates, 1 gram of protein, 0.8 grams of fat, 1.1 grams of cellulose. The cellulose in oat milk is water-soluble dietary fiber, containing more β-glucan, which can promote intestinal peristalsis and increase the amount of water in the stool, which is beneficial to patients with constipation, as well as to the general population’s intestinal health. Relative to milk, oat milk protein content is relatively low, while the protein in oats is non-quality protein, the human body’s eight essential amino acids are not a full range of content is not high, so from the perspective of protein, its nutritional value can not be compared with the traditional cow’s milk, goat’s milk. However, drinking oat milk in moderation is not harmful and can still supplement the body with a variety of nutrients, but should not be excessive. Due to its slightly higher carbohydrate content, excessive consumption can easily lead to obesity. At the same time, because oats contain more water-soluble dietary fiber, overconsumption can easily cause indigestion and other symptoms. People who are allergic to oats should not drink oat milk.