Some experts believe that sugar is more harmful to human body than cigarettes and alcoholic beverages. The World Health Organization has investigated the causes of death in 23 countries, and concluded that sugar addiction is more harmful than smoking, and long-term consumption of foods with high sugar content will shorten people's life span by 20 years. Therefore, 1995, the World Health Organization put forward a new slogan of "global sugar ban". A survey by the World Health Organization found that eating too much sugar can lead to heart disease, hypertension, arteriosclerosis, cerebral hemorrhage and diabetes. Long-term high-sugar diet will make the internal environment of human body unbalanced, and then cause various hazards to human health. Because sugar is an acidic substance, eating too much sugar will change the pH of human blood, present an acidic constitution, weaken the resistance of human white blood cells to external viruses, and make people susceptible to various diseases. People who love sweets for a long time are likely to cause a variety of eye diseases. Experts also suggested that senile cataracts are also related to excessive sweets. They investigated 50 cataract patients and found that 34% of them have the habit of eating sweets, which they think is related to the disorder of glucose metabolism.