Fructose can provide energy for the body, moderate intake is generally not much effect, but too much consumption will induce obesity, gout, diabetes, non-alcoholic fatty liver disease. 1. Obesity: in daily life, many fruit juice, fruit, milk tea, etc., the fructose content is higher, so it contains more calories, which will lead to a lack of exercise is prone to obesity. 2. Gout: fructose metabolism occurs in the liver, excessive intake of fructose will produce a large amount of uric acid, gout patients with hyperuricemia should not be excessive intake. 3. Diabetes: excessive fructose will reduce insulin sensitivity and increase blood sugar levels. 4. Non-alcoholic fatty liver: excessive fructose intake will accelerate the synthesis of hepatic glycogen, promote the liver from the beginning of the synthesis, but also inhibit the activity of fatty acid oxidase, reduce the decomposition of fat, increase the accumulation of fat, easy to lead to non-alcoholic fatty liver. Fructose is widely found in fruits, usually moderate consumption of fruits, not excessive, otherwise it is easy to cause harm to the body.