Occasional snacking in small amounts is not harmful. However, if excessive intake of unhealthy snacks may be harmful to health, including damage to dental health, leading to malnutrition, obesity and so on. 1. Damage to dental health: some sugary snacks, such as a variety of candies, snacks, sugary drinks, etc., eaten before going to bed at night and drink without brushing, it is easy to damage the teeth, is a common cause of dental caries. 2. Malnutrition: long-term intake of some of the snacks without nutrition, and even snacks as meals, over time is likely to lead to malnutrition, especially children and adolescents during the growth period is the most vulnerable. 3. Lead to obesity: many snacks belong to fried food, puffed food, or salt and sugar-containing food, such as potato chips, French fries, instant noodles and so on. Long-term large intake, easy to get fat over time. In summary, it is recommended to eat some snacks occasionally and try to choose healthy snacks. However, attention should be paid to avoid a large number of unhealthy snack intake, in order to prevent harm to the body.