Among the causes of anorexia are psychological factors and poor eating habits, which often require timely guidance and correction. For example, when eating to concentrate, do not eat while playing or watching TV; to pay attention to the atmosphere at mealtime, should not criticize or chastise the child at mealtime, nor force-feeding; to develop a regular, fixed-position meal; for children who are playing excitedly, 15 minutes before the meal to tell the child to gradually stop the activity, so that attention to the meal; to pay attention to the cooking of food, such as color, aroma, taste, to promote appetite. In addition, anorexia is associated with nutrient deficiencies. Vitamin B1 deficiency decreases intestinal motility and appetite. Also overlooked is the lack of lysine, which can also cause low appetite. What is the relationship between lysine and low appetite? Lysine is an essential amino acid in the body and must be consumed from food. It is mainly found in animal foods, and the amount of lysine in cereals is very small. Moreover, it is easily destroyed during the cooking and boiling of food. Lysine is necessary for the synthesis of endogenous carnitine in the body, and the latter is a necessary part of intracellular fat transport and utilization. The lack of lysine in the body can lead to muscle weakness, low muscle tone, reduced intestinal motility and poor appetite; after supplementation with lysine and vitamin B1, intestinal motility is enhanced, appetite increases and appetite improves. In addition, lysine is also involved in the synthesis of various digestive enzymes in the pancreas, which can promote digestion.