Skimmed milk is a popular kind of milk. The production of skimmed milk to meet the modern pursuit of "high protein, low fat" nutritional needs. And for some special people is very suitable. It enables these people to better absorb nutrients and have a healthy body. When drinking milk, some people have the habit of heating milk. But after the milk is heated, sometimes there will be a layer of milk skin on the milk. So skim milk after heating milk skin?

There is a milk skin.

First, pour the milk into the pot just boiling can be (burned for a long time will destroy the protein, and can not afford the milk skin), and then poured into a large bowl, then you can see the surface of the milk to form a layer of wrinkled milk skin.

If you only drink a glass of milk or yogurt every day, healthy adults and children do not need to choose skimmed products, directly drink full-fat products can be, delicious and nutritious. For middle-aged and elderly people, consider choosing low-fat products fortified with vitamins A and D (fat content of 1.0% to 1.5%); if there is a doctor's advice to drink skimmed milk, and the number of daily milk consumption of more than 2 cups, you can consider skimmed milk. In addition, obese people, diabetics are suitable for drinking skimmed milk.

A few notes on the correct drinking of milk:

1, milk should not be drunk raw, heated to see the boil that is taken, milk at 100 degrees Celsius when the lactose began to caramelize, decomposition into lactic acid and formic acid, reducing the nutritional value. Milk boiled for a long time, the color becomes brown, lipid aroma is reduced, protein denaturation precipitation, vitamin loss, milk contains anti-infant diarrhea rotavirus antibodies, but also be destroyed.

2, don't add sugar after the milk is boiled and cooled a little, lysine and fructose in milk at high temperatures to form fructose lysine, harmful to the human body. Sugar is acidic, milk calcium is alkaline, the combination of the two make a lot of calcium loss. It is best not to add sugar.

3, should not drink milk on an empty stomach, fasting body is in a state of hunger, the demand for energy stage. Drinking milk at this time will be protein.

Infants can drink whole milk, healthy adults should drink skim milk or low-fat milk. People who suffer from high blood cholesterol, hypertension, thrombosis and other cardiovascular system diseases, as well as diabetes, obesity and other metabolic diseases should drink skim milk.

Milk in the heating process, the expansion of milk fat and the decline in the viscosity of the emulsion to promote the uplift of fat, so that the fat gathered to the surface of the milk, with the continuation of heating, the fat globule membrane protein denaturation, the loss of fat globule membrane fat is not stable, it is easy to coagulate together, and at the same time, coagulation in the milk fat will also be adsorbed in the milk of the casein, whey proteins, reduce the surface tension, and finally the formation of a more Stabilized skin film, which is one of the very important nutrients, will coagulate once heated. The proteins in the milk will also be coagulated due to heating, which is what we see in the "milk skin".

Skim milk heating drink notes: skim milk heating attention to temperature. Once the milk is heated to more than 60 ℃, the nutrients begin to be destroyed. When heated to more than 100 ℃, many protein components will undergo a denaturing reaction, and vitamins will be lost in large quantities. Especially the biologically active components, known as the essence of milk, can easily be destroyed after intense heating. Milk heating, indeed, will make the nutritional value of milk reduced. Many nutrients in milk, such as vitamins, proteins and biologically active substances and other components, are more sensitive to high temperatures and are easily destroyed in the process of heating. The higher the heating temperature and the longer the time, the more serious the destruction. In particular, some friends will pour the milk into the pot directly boil, or into the microwave oven in high temperature heating, which will lead to the nutritional value of milk greatly reduced.