Under normal circumstances, large meals are more likely to result in excess energy intake and an increased risk of overweight and obesity, while on the other hand, body weight stays the same or decreases, and the risk of malnutrition increases. 1. In general, people with large meals have a good appetite, and the intake of a variety of foods such as staples, meat, vegetables and fruits will be larger, and overall, the energy intake is more. If the body digestion, absorption capacity is relatively strong, this time the body activity consumption is not large enough, it is easy to lead to excess energy, stored in the form of fat, weight gain. 2. People who generally have small meals tend to have a poor appetite and problems with digestion and absorption; or they are thin and weak and tend to eat less; or they may control their food intake for the purpose of weight loss. In either case, if the energy and nutrients obtained through food do not meet the body’s needs, it is easy to cause weight loss and malnutrition. To know the effect of meal size on the body, weight is a good indicator to observe, as a stable weight is an outward sign of a stable body condition. If you wish to clarify your physical condition, it is recommended that you visit a hospital for relevant examinations.