Starch is prone to indigestion, intestinal flatulence and diabetes, as follows: 1. Most foods are rich in starch, which can promote intestinal peristalsis, reduce constipation, and have a preventive effect on intestinal cancer. However, starch is relatively difficult to digest and excessive intake will increase the burden on the digestive system, so it is more likely to have indigestion; 2. When starch is digested, it will produce fermentation reaction with bacteria in the intestine, and even produce a lot of ammonia, hydrogen sulfide and other gases. Therefore, excessive intake will lead to intestinal flatulence and increased exhaust; 3. After entering the intestine, the intestinal system will break down the starch into sugars. Excessive intake of starch will lead to excessive sugar content in the body, which will not only lead to weight gain, but also be detrimental to the control of blood sugar in diabetic patients.