The statement that "frozen breast milk should be boiled before feeding" has been approved by some people, but it has also been questioned by many people, who think this view is misleading.
The emergence of refrigerated breast milk is because many working mothers have become breast-huggers because they don't want to delay breastfeeding at work. Every day before going to work, they will squeeze the milk and put it in the refrigerator. At work, they will squeeze the milk and put it in an ice bag, then take it home and put it in the refrigerator. However, some babies may have persistent diarrhea after drinking this "refrigerator milk".
How to treat breast milk after refrigeration before feeding it to children?
The reality is that many young mothers have to go to work. If you want to continue breastfeeding your child, you can only squeeze it out in advance and put it in the refrigerator at home or take it home after milking in the office. Wang Dingmian said that whether it is put in the office refrigerator, in your own ice bag or at room temperature, a certain amount of bacteria will be produced after a long time, and it is no exception to put it in your own refrigerator. In addition, in the case of hot weather in summer, if breast milk is stored at room temperature, it may deteriorate for a long time.
Li Rite, a professor at the College of Food Science and Nutritional Engineering of China Agricultural University, said in an interview that some babies have diarrhea after eating the breast milk stored by working mothers, which is caused by the excessive reproduction or deterioration of breast milk bacteria. In order to prevent this from happening, it is a scientific and prudent method to sterilize breast milk at high temperature.
However, Wang Dingmian, a senior dairy expert and chairman of Guangzhou Dairy Association, said that high-temperature disinfection does not mean that breast milk must be boiled. Although it can kill bacteria in breast milk, the effective components in breast milk will also be destroyed, resulting in a significant decline in nutritional value.
"In fact, it is enough to heat breast milk to 65℃ ~ 75℃. This temperature can sterilize breast milk without losing too many active ingredients. Of course, it should be noted that the disinfection time at this temperature is generally controlled at 1 ~ 2 minutes. " Wang Dingmian said that if working mothers have good conditions for breast milk preservation, breast milk can be stored at 4℃ whether in the refrigerator or in an ice pack. As long as the time does not exceed 4 hours and the container itself has been disinfected and cleaned, breast milk can generally be heated to 30℃ ~ 37℃ to feed children.
In addition, it is best not to heat the refrigerated breast milk above 40℃, because in terms of breast milk heating, above 40℃ is a high temperature, which will lead to the loss of some active ingredients in breast milk.
Wang Dingmian also said that for infants under 1 year old, breast milk is the best nutrient, because breast milk not only contains nutrients easily digested by newborns, but also contains rich active ingredients, which can help infants resist infection and regulate immunity. It is the best choice for newborn feeding. Therefore, in many foreign countries, it is not recommended to feed milk powder to children under/kloc-0.
"When breastfeeding, it is the best way for babies to suck naturally from their mothers' breasts, which is not only safe but also hygienic. "Wang Dingmian said that if working mothers are milking when they get off work, 1 can get home in more than an hour, so it is no problem for breast milk to be fed to children without heating. Of course, in order to prevent the milk from getting too cold, you can also feed it again with warm water.
Plastic wrap is not a "welfare" device to lose weight.
I believe some people around you think that wrapping thin parts with plastic wrap during exercise can increase local temperature, sweat a lot and burn fat. Unfortunately, such a means of losing weight can't stand scientific torture.
Plastic wrap has poor air permeability. Wrapping it around the body during exercise will really raise the local body temperature, and the body will sweat a lot in order to dissipate heat. After sweating, people may lose weight, so many people think that losing weight is really effective, but they don't know that losing weight is mainly the water lost from the body. After adding water, the weight will come back, and the fat in the fat cells will not run away with sweat.
Some people can't help but ask, can raising the temperature accelerate metabolism and always promote fat burning? In fact, fat consumption, like many other physiological processes in the human body, involves a precise and accurate regulation process, and high temperature is not necessarily a good thing for this process.
When people exercise, there are two main substances that provide energy for muscles: glycogen and fatty acids. Sugar originally comes from carbohydrates, while fatty acids are decomposed from triglycerides. Triglycerides stored in adipose tissue are decomposed into fatty acids, which are transported by blood to muscle parts that need energy and are the main source of fatty acids during exercise. Fatty acids are eaten into the cytoplasm by muscle cells, and after a series of transformations, they will be transported to the mitochondria of the "energy factory" and eventually become energy that cells can directly use.
Many scientists have been studying the factors that affect the oxidation rate of fatty acids. For example, some studies have pointed out that when the intensity of human exercise increases from low intensity (25% of the maximum oxygen consumption) to medium intensity (65% of the maximum oxygen consumption), the oxidation rate of fatty acids has been increasing, but when the intensity of exercise is high (85% of the maximum oxygen consumption), the oxidation rate of fatty acids will decrease and the consumption of glycogen will increase greatly. Therefore, moderate and low intensity exercise is more suitable for the consumption of fatty acids. In addition, some studies have pointed out that both exercise patterns and eating habits may affect the oxidation rate of fatty acids. However, there is nothing related to body temperature in many studies, and there is no evidence that increasing temperature can accelerate the oxidation of fatty acids.
In fact, there are many important enzymes involved in the process of fat "burning", and the enzymes in the human body are very sensitive to the reaction conditions. Generally speaking, the optimum temperature is between 35℃ and 40℃. Once the temperature exceeds 40℃, the activity of the enzyme will drop sharply, and even the enzyme itself will decompose. Therefore, the local high temperature caused by plastic wrap wrapping muscles may not promote fat consumption, but it is likely to have the opposite effect.