1, low calorie: Because the fat content in skim milk is very small, the calorie of skim milk is 45% lower than that of whole milk.

2. Low cholesterol: As cholesterol is a kind of "fat-soluble substance", it mainly exists in milk fat, while skim milk has less fat content, so the cholesterol content is reduced by more than 70% compared with whole milk, which belongs to "low cholesterol milk".

3. Low content of fat-soluble vitamins: Vitamins A, D, E and carotenoids are "fat-soluble substances". With the removal of milk fat, their content in skim milk will be greatly reduced, or even almost none.

4. Skim milk has little difference with whole milk in protein, lactose, calcium, sodium, potassium and B vitamins.

Milk is people's favorite nutritious food. However, milk contains more fat, and the fat content per100g of milk is more than 4g. This fat content is not good for those who are obese and have high blood fat. In the absence of skim milk, you can skim it yourself to make skim milk.

After the fresh milk is boiled with low fire, keep it away from the fire source and let it cool. After forming a film (cream) on the surface of milk, peel it off gently. Then the milk is boiled, cooled, and the film is removed, and this is repeated several times until there is no conjunctiva on the surface of the milk after cooling. In this way, the fat is removed and it becomes skim milk.

Extended data:

The packaging difference of milk

1, tetra pak

Tetra Pak packaging is sealed, that is, milk is poured into a paper tube and then cut and sealed, so there is no air inside. Tetra pak is a six-layer composite package composed of paper, aluminum and plastic, which can effectively isolate the contact between milk and air, light and bacteria, so it can be stored at room temperature, with a longer shelf life, with tetra pak pillows reaching 45 days and tetra pak bricks reaching 6 to 9 months. Tetra Pak packaging has high cost performance and low cost. This technology has been widely used in milk packaging in developed countries.

2. Roof box

Roof box, also called fresh-keeping house, is a kind of paper-plastic composite packaging. Its roof-shaped carton is a multilayer composite film, the outermost layer of the carton is a plastic film, the middle layer is fiber, and the inner layer of the product is aluminum foil. The top box is beautifully printed, which is generally suitable for filling high-grade products with high nutritional value and fresh taste, such as fresh milk, colored milk, yogurt and lactic acid bacteria drinks, but it needs to be stored in cold storage, so the shelf life of milk is relatively short. The source of packaging materials for the roof box is not only packaging paper produced by Tetra Pak and Japan, but also packaging paper produced by domestic enterprises.

3. Sterile plastic bags

The packaging materials of aseptic plastic bags are specially treated, and there is a black coating inside the plastic bags, which can isolate light. However, due to the thin aseptic plastic bag, even after special treatment, its effect of isolating light cannot be compared with that of aluminum foil, so the shelf life of milk at room temperature is about 30 days.

4. Glass bottles

Glass bottle is a traditional milk packaging, which has the characteristics of environmental protection, reusability and low cost. Non-toxic, odorless, transparent, beautiful, good barrier, airtight, heat-resistant, pressure-resistant and cleaning-resistant, and can be sterilized at high temperature and stored at low temperature. But its disadvantages are inconvenient to carry, heavy and easy to break.

5. Bailey bag

Its structure is multi-layer aseptic composite film, including three layers of black and white film, five layers of high barrier film, seven layers of extruded film and aluminum-plastic composite film. The shelf life of different materials ranges from 30 days to 180 days. Bailibao is a new low-cost packaging form. The shelf life of milk packaged by Bailibao is generally 45 days, and the shelf life can reach 2 ~ 3 months with appropriate preservatives.

6. Combibloc

Combibloc is a kind of aseptic packaging, similar to Tetra Pak packaging. Kangmei packaging is an "open" packaging. Its filling method is to directly fill the carton, and the upper part of the carton is not sealed. Fill the milk first, and then the machine automatically seals the top of the carton. In order to ensure the sterility of the whole filling process, the inside of the equipment is sterile air to maintain positive pressure, so there is a certain gap between the milk and the top of the carton when sealing, and the air in the gap is sterile and will not affect the quality of the milk.

References:

Baidu encyclopedia-milk