The classification of foods according to their constituents:

Foods: area unit a lot of or less advanced substances. they're all capable of providing the body with the nutrients essential for its development and protection. Some offer the fuel required for its metabolism.

they're composed of one kind of organic substance (carbohydrates, lipids or proteins), and water and mineral salts. complicated foods: square measure composed of many styles of organic substances, and water and mineral salts.

Simple foods consist basically of just one class of nutrients: carbohydrates, lipids, or proteins. These foods additionally contain vitamins, however in little quantities. straightforward foods consisting of carbohydrates square measure basically foods from cereals (pasta, rice, wheat, ...). Foods containing solely lipids square measure the oils, the butter. Foods wealthy in supermolecule square measure meat, offal, fish, eggs, milk; thus, there aren't any straightforward foods containing solely proteins.

This is unit honeyed foods and starchy foods. Sweets, sauces, sodas and a few saute dishes bring an oversized quantity of carbohydrates. a number of these carbohydrates area unit quickly assimilated (fast sugars) and quickly offer energy to the body; others, found in flours (bread, cakes, pies) have slower digestion (starchy foods or slow sugars) and supply energy step by step to the body

In a sizable amount of sauteing dishes, the quantity of fat is incredibly necessary within the sauce. Some by-products like appetizers, chips, and tater have an awfully high proportion of lipids. Cheeses from milk process, area unit complicated foods made in lipids

Meat, fish, and eggs area unit the most foods made in the macromolecule. The dishes saute from these foods area units thus terribly made in the macromolecule. Some vegetables, like lentils or soy, area unit terribly made too

Difference between AN organic body and a mineral body:

Water (and drinks): Water is that the solely essential drink. it's contained in food, however, it should even be brought by drinks. It represents sixty to seventieth of the body mass. it's a non-negligible supply of mineral salts and ensures the transport of varied substances within the body. There area unit many glasses of water whose mineralogical composition varies.

Sugary drinks (sodas, lemonades, fruit juices, chocolate drinks) contain a big quantity of sugar. The drinks obtained directly from the fruits area unit wealthy in vitamins. The drinks area unit obtained, either from the ironed fruits, or from fruit concentrate, that's to mention a dehydrated fruit powder that then permits to restructure a drink by adding water. The vegetable-based drinks area unit is usually wealthy in vitamins. they are available from the vegetable itself however also can be enriched

  Mineral salts area unit erratically distributed in foods: some are often terribly wealthy in a very class of mineral salts, as an example metal for dairy farm merchandise, or atomic number 12 in chocolate. There area unit major minerals and minerals that area unit in terribly little quantities known as trace parts (trace amounts)

-The major elements: metallic element K, sodium Na, calcium Ca, atomic number 12 Mg, phosphorus P, sulfur S, halogen Cl, iodine I, fluorine F

-The trace elements: iron Fe, metal Mn, cobalt Co, zinc Zn, bromine Br, copper Cu, silicon Si, atomic number 24, tin Sn, ...

These parts area unit necessary for the expansion (building materials) and metabolism (functioning) of our body.

-Carbohydrates

Carbohydrates, or carbohydrates, ar diagrammatical by sugars and starches. supposed "fast" sugars aldohexose, grape, ketohexose fruit and honey, brain sugar of sure plants, sucrose, a gift in cane sugar and beet sugar, milk sugar and disaccharide from the process of starch.

 supposed "slow" sugars, starch (rice, wheat) and foods derived from seeds (flour, bread, pasta, pastries). Carbohydrates are energy foods that play a very important role within the effort. Their degradation within the body provides four calories per gram. they're holding on within the body as polysaccharide, particularly within the liver.

  Or fats, ar the vehicles of fat-soluble vitamins, particularly calciferol. Some fatty acids ar referred to as essential fatty acids (A.G.E.) as a result of the body can't synthesize them. They play a task within the metabolism of steroid alcohol. Lipids are terribly energetic foods that unharness 9 calories per gram.

They play a really vital role within the fight against the cold. they're holding on within the body as fat (fat).

      Proteins, or proteins, ar atomic number 7 compounds containing amino acids. they need a creator role. The molecule is so the premise of all living matter and is indispensable within the development and repair of cells and tissues.

Foods are wealthy in macromolecule ar cheeses, meat, and fish for animal proteins, legumes and cereals for vegetable proteins. Animal proteins have the next price than plant proteins as a result of they supply a larger quantity of essential amino acids. Proteins are energetic foods that give four calories per gram, however, the molecule provides, whereas degrading, organic compound and acid, that are eliminated through the excrement.

They are indispensable substances always, the deficiency of that causes serious disorders. They act in minute doses and function regulators of the body. every aliment fulfills a selected role. They intervene chiefly within the style of co-enzymes, essential molecules for the conclusion of the metabolic and energetic reactions of the organism.

 they're classified into 2 teams in line with their solubility in fats (fat-soluble vitamins) or in water (water-soluble vitamins). Fat-soluble vitamins are named A, D, E, K. soluble vitamins are vitamins of B (B1, B2, PP, B6, B10, B12), vitamin C, bioflavonoid or C2 Some vitamins are destroyed by heat, conjointly should the diet embody raw fruits and vegetables.

The elements of synthesis make sure the growth and also the multiplication of the cells additionally because of the traditional maintenance of the body; they're proteins and a few minerals (calcium, metal, and phosphorus).

The energetic substances play a task within the manufacture of cells, indigestion or just within the maintenance of bodily functions as the constant temperature of the body; it is the carbohydrates and also the lipids

The regulation substances permit AN economical use of energetic substances and synthesis components by the body, a lot of specifically the cells; it's regarding water, vitamins, and minerals