How to heat pure milk
4hw.org: milk is the most common nutritional food in our diet. Most of the time, we drink milk directly. However, when the weather turns cold, many people want to drink a cup of hot milk to warm their stomach and heart. How to heat the milk? Let's have a look!
Can pure milk be heated
Pure milk is better not to be heated. The longer the milk is heated and the higher the temperature is, the more serious the loss of nutrition will be. There are mainly vitamins, of which vitamin C is the most serious loss, followed by lactose.
So, how to heat the milk correctly? In fact, it is the most appropriate to use water-proof heating method. Drink a cup of 250 ml milk and heat it with a gas stove. Usually boil it at 70 ℃ for 3 minutes and 60 ℃ for 6 minutes. Then use the microwave oven, about one minute. But we should pay attention to the phenomenon of uneven temperature when using microwave oven for heating, so stir it before drinking to avoid being burned.
Experts pointed out that if heating can be avoided, do not heat as much as possible, only in this way can the nutritional value of milk be guaranteed, especially for children, good milk nutrition is more conducive to growth and development.
Can I still drink the bitter milk
The phenomenon of milk bitterness is often found in bagged milk and boxed milk, especially in the former. The main method of bag milk processing is ultra-high temperature instantaneous sterilization, which can kill bacteria quickly and destroy the 'proteolytic enzyme' secreted by bacteria rapidly. Although bacteria will not revive after being killed, a small part of the inactivated proteolytic enzyme may slowly restore the original protein structure in the storage process. Once the structure is restored, their activity will also a stirring among the dry bones. The only function of proteolytic enzyme is to cut the protein in milk into pieces, that is to hydrolyze it into peptides. Due to the high hydrophobicity of milk protein and the bitter taste of some peptides, bitter milk is formed. However, although these hydrophobic peptides have bitter taste, they are not toxic, that is to say, the bag milk can also be digested and absorbed by the human body, and will not have a significant impact on health.
Don't worry too much about it, but it's uncomfortable to drink this kind of milk, so try to avoid it. Bitter milk and normal milk are difficult to distinguish by naked eyes, because it does not expand the bag or flocculate. Before buying the whole box of milk and boxed milk, pay attention to the production date of the product, try to buy the fresh product, and drink it as soon as possible to avoid long-term storage. 'because it takes a long time for the enzyme in milk to recover its activity after sterilization, usually more than one month, so the taste of fresh factory milk is generally normal.
Precautions for drinking milk
1. First of all, milk should not be eaten after being frozen and preserved
In life, some people want to buy fresh milk in bags that can be eaten for a week at a time, and then put it into the refrigerator to freeze and take it as they drink. In fact, it is unscientific to do so. After the frozen milk is thawed, there will be coagulated sediment, the floating fat will be obviously thin, and there will be abnormal smell, the liquid will be water, and the nutritional value will be significantly reduced. If stored for too long, there will be food hygiene problems.
2. In addition, calcium powder should not be added to milk
Because the protein in milk is mainly casein, when the milk is added with calcium powder, casein will combine with calcium ion to make the milk coagulate. When the milk is heated, other proteins in the milk will precipitate with calcium, thus affecting the absorption of nutrients. Milk itself is rich in calcium, and it keeps a reasonable balance with other ingredients in milk. Under normal circumstances, precipitation generally does not occur. Therefore, when you eat milk, you do not need to add calcium powder.
3. The best time to drink milk is to drink a glass of milk before breakfast
The energy supply of breakfast accounts for 25% - 30% of the total energy demand, which can provide sufficient nutrition guarantee for the vitality of the day. Milk can also be drunk around 4 p.m. and 1 hour before dinner. Drink a glass of milk before the evening break, it will help the body absorb its nutrients, and it can also play a hypnotic role.
4. Children who drink milk as the main food should not drink more than 1kg of milk every day, or there will be hidden bleeding in the stool
If a child drink too much milk, not only can not supplement nutrition, but also prone to anemia, while the elderly drink too much is prone to cataract.
5. In addition, people with cold, ulcer, cholecystitis and enteritis who drink more milk will aggravate their condition
In addition, some people like to eat milk and chocolate together, which is also unscientific. Milk and chocolate will make oxalic acid in milk generate calcium oxalate, which will lead to calcium deficiency, diarrhea, dry hair, fracture and urinary calculus.