Nutrients that accompany people throughout their lives are protein, carbohydrates, fat, inorganic salts, vitamins, water, dietary fiber, macronutrients: calcium, phosphorus, magnesium,, potassium, sodium, chlorine, and trace elements: iron, iodine, zinc, selenium, copper, chromium, molybdenum, fluorine, cobalt, manganese, etc. Good dietary nutrition can make people more resistant, can promote the growth and development of children, to prevent the occurrence of many diseases, in the same disease-causing conditions, some people develop disease, while some people are not sick, some people are seriously ill, some people are light, which is caused by the different resistance of people, many nutrients and human resistance has a direct relationship, so good dietary nutrition can make people do not get sick, or even if you get sick, but the disease will be lighter. will be less severe. Good nutrition can also make people live longer, many kinds of nutrition have antioxidant and remove the role of oxidation products, so it can make people aging delayed and maintain vigorous energy and physical strength. A balanced diet is recommended For a healthy person a balanced diet is always the first priority. It is the highest level of nutrition to achieve the nutritional requirements through normal meals. For the vast majority of people, through a reasonable daily diet, is fully able to meet the body’s needs II. which groups of people need to supplement nutritional supplements 1, sick people can not eat normally. 2.Women who are preparing to get pregnant. 3.Women during pregnancy and breastfeeding. 4.Menopausal women. 5.People who lose weight. 6.The elderly 7.People with malnutrition absorption. 8, people who drink, smoke, and often drink coffee. 9.People with irregular diet. 10, unbalanced diet structure, nutrient deficiency symptoms. 11.People with high work pressure and lack of sleep. From its see, for people who can’t have a balanced diet, and people with irregular life, under the premise of ensuring a balanced diet, proper supplementation of nutritional supplements is beneficial, and can also make up for the loss of some nutrients in the cooking process. Third, from the clinical point of view, how to determine a person’s nutrient deficiency 1, physical examination (such as hair, facial color, eyes, lips, tongue, teeth, face, skin, nails, cardiovascular system, digestive system and nervous system …) 2, dietary survey (summarize their recent recipes to ask the dietitian to do evaluation, so as to check which nutrients may be deficient, and ask the dietitian to give scientific adjustment in daily life.) 3, biochemical examination, scientific analysis through laboratory tests. Fourth, nutritional supplements do not overdose Nutritional supplements should be supplemented in moderation, in order to play a beneficial role in supplementation. Not more is better. For nutrients are divided into fat-soluble vitamins and water-soluble vitamins, the fat-soluble vitamins are not easily and quickly excreted by the body after a large number of supplements, chronic toxicity can occur. However, because water-soluble vitamins, if supplemented in excess, can be excreted through the urine, or less prone to poisoning.