Eating too many blueberries can be harmful, including indigestion, raising blood sugar, and affecting dental health. Blueberry is a common fruit in daily life. In addition to the regular sugar, acid and vitamin C, blueberries are rich in vitamin E, vitamin A and so on. Every 100 grams of blueberries contain 57 calories, of which carbohydrates are 14.49 grams, 0.74 grams of protein, 0.33 grams of fat, 2.4 grams of dietary fiber, and vitamin C 9.7 milligrams. Eaten in moderation, it can provide a certain amount of calories and carbohydrates, and dietary fiber is relatively rich, which can promote intestinal peristalsis. The dietary fiber in blueberries is more difficult to digest, and excessive consumption of blueberries may lead to indigestion. Blueberries contain high levels of sugar and are easily absorbed by the body, and excessive consumption of blueberries by diabetic patients may lead to elevated blood sugar, which is not conducive to blood sugar control. Blueberries contain fruit acids and sugar, blueberries eaten too much may corrode teeth. Blueberries need to be consumed in moderation, do not overeat, so as not to cause adverse reactions.