Sugar, protein and fat are the most important nutrients for children's normal growth and development. Sugar (carbohydrate) is the main source of human heat. Glucose is a monosaccharide, which can be directly used when it enters the body. 1 ~ 6 months old babies, the sugar in food is mainly lactose and a little starch. After 4 months, starchy foods gradually increased. By the age of 1 year, various enzyme systems for digesting starch in gastrointestinal tract were gradually improved, which could be rapidly hydrolyzed into glucose in small intestine and absorbed into blood. After energy absorption, it can be directly supplied or stored in the form of glycogen, and the excess can be converted into fat.

The human body usually does not eat glucose, and there is no shortage of glucose in the body. So you don't need to add it at ordinary times. However, when children are sick and refuse to eat, their constitution is extremely weak. In order to ensure the needs of children's basal metabolic heat, it is advisable to feed glucose for a short time, and sometimes it is given intravenously. This is a fact. However, it is considered that glucose has high nutritional value. If it is overfeeded for a long time and other food supplies are neglected, it will affect children's appetite. If protein and other nutrients are not supplemented, it will lead to growth retardation, severe recurrent infection and malnutrition. It will also cause transient diabetes due to elevated blood sugar, with symptoms such as thirst, polydipsia and polyuria.

The glands that produce other digestive enzymes in children's digestive tract are abandoned, which will lead to atrophy over time, further reduce digestive function and prevent them from eating other foods. Normal children should try to let them eat more starchy food and practice chewing to promote salivary gland secretion, enhance appetite and digestive function, which is beneficial to the development of maxillofacial bones and teeth.

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