What are the 6 major nutrients? What are the functions of each? Which foods contain these nutrients.

The human body must have six major nutrients.

Nutrients refer to the main nutrients that sustain human survival. It generally includes six categories, namely proteins, fats, carbohydrates, minerals, vitamins, and water.

Protein Main physiological role: Protein is one of the basic building blocks of cells. Proteins make up the nucleus, cytoplasm, organelles, cell membranes, and thus tissues and organs.

Babies develop rapidly and need a lot of protein, which is the "root" of life. It is composed of physiologically active substances such as enzymes, hormones, and antibodies to play the role of food digestion and absorption, and enhance immunity. Maintain a stable internal environment.

Protein, and the maintenance and distribution of water are also affected by protein.

Fat Main physiological function: store heat energy, which can be used by the human body at any time. Fat is the highest caloric substance in the body, twice as much as the amount of calories produced by oxidation of proteins or carbohydrates.

It is called a "vault" of thermal energy. Thermal protection. It plays the role of heat insulation and heat preservation in the body, and at the same time supports, fixes and protects organs, tissues, joints, etc. like a "soft cushion" to prevent damage.

Promotes growth and development. Fat is the main component of cells and tissues, and is an important material basis for the growth and development of infants, especially for brain development. Dissolves and aids in the absorption of fat-soluble vitamins.

Fat-containing meals are more fragrant, enhance appetite, delay gastric emptying time, maintain sensibility, and reduce gastrointestinal burden.

Main food**: Vegetable oil is richer in essential fatty acids than animal fat, peanut oil, soybean oil, sesame oil is more than rapeseed oil, and poultry is higher in animal fat than lard in essential fatty acids, and beef and sheep fat are the least.

Carbohydrates.

Main physiological effects: carbohydrate is the main energy supply substance in the body, and all the energy required for nervous system function activities is provided by it, which is the "gas station" of calories, which provides the energy required for amino acids to synthesize protein in the body, and can promote the growth and development of children.

Main Foods**: Mainly from cereals, root foods and sugar. Vegetables and fruits contain small amounts of fructose, pectin, and vitamins. Animal foods are very low in sugar, and animal and vegetable oils do not contain sugar.

Minerals Main physiological role: Minerals are the "housekeepers" of the body's metabolism. It has the function of maintaining and adjusting the body. The minerals and trace elements that have a greater impact on children's growth and development include calcium, iron, zinc and iodine.

The six major nutrients in food.

Carbohydrates (sugars), oils, proteins, vitamins, water and inorganic salts (minerals) are the six major nutrients in food. The main role is the composition of the body, providing energy.

Macronutrients, in addition to fiber and water, provide energy to the body and are measured in jouls or calories. Each gram of carbohydrates or protein provides 4 kcal of energy and 9 kcal per gram of fat. Other nutrients, including fiber, water, minerals, and vitamins, do not provide the amount of energy that can be used in the body's physiological activities.

Food contains six kinds of nutrients such as protein, sugar, fat, vitamins, water and inorganic salts, among the six types of nutrients contained in food, sugar, fat and protein can provide macrobent energy for the human body, and these three types of substances are also the components of tissue cells, among which sugar is the most important energy-supplying substance, and fat is also an important energy-supplying substance, but most of the fat in the human body is stored subcutaneously as a backup energy source, which belongs to the storage of energy substances. Protein can also provide a part of the energy for life activities, but protein is mainly the basic substance that constitutes tissue cells, and is an important raw material for human growth and development, tissue repair and renewal. Water, inorganic salts and vitamins do not provide energy for the human body, but they are important for maintaining normal life activities.

The main food of sugar** is steamed bread, bread and other foods rich in starch. Fatty meats, peanuts, etc. are rich in fat Lean meats, beans, and milk are rich in protein. Vegetables and fruits contain a lot of vitamins and inorganic salts.