For people who spend three or four days a week doing physical exercise, if they stop exercising, will their muscles get fat? Health care guru Dona Richardson-Yule said: "This will not happen. Muscle is muscle and fat is fat. There is no mutual transformation between the two. " Walter Thompson, a professor of sports science at Georgia State University, said that muscle is a relatively dense substance, while fat has a relatively high density. When you stop exercising, your muscles will become a little slack, but they will not become fat. Is the reverse true? It's a pity that physical exercise won't turn fat into muscle. Lal Sz mansker, a member of a sports club, said: "Although fat will not be converted into muscle, if you want to have developed muscles, you must do stretching exercises to eliminate excess fat in your body." Early to bed and early to rise is good for health.

With the increase of age, the earlier melatonin related to sleep is secreted, so the elderly tend to go to bed early and get up early, which is more in line with the natural physiological clock. Young people (especially teenagers who are still developing) only need to work and rest according to their own physiological clock; But it is better not to exceed 1 1 pm, because it is the secretion time of growth hormone in vivo from 1 1 pm to 1 am. If you don't sleep at this time, the developing young people will not grow tall, and adults will easily get old. Sleeping naked is healthier.

Experts believe that sleeping naked is just comfortable and has nothing to do with health. Although wearing clothes and sleeping will affect perspiration and skin heat dissipation, human dander falls off all day, which is the nutritional source of dust mites and molds. There must be some microorganisms lying naked on the sheets and sheets, which are more likely to contact the skin. Sleeping naked may increase the risk of infection.

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8 glasses of water a day to keep healthy.

Everyone needs different water. Drinking too much is not only unhealthy, but also a burden on the kidneys. The water absorbed by the human body is excreted through perspiration or respiration, and also needs to be metabolized through the kidneys. If you drink too much water, the water output of the kidney will increase, which will increase the burden on the kidney and easily lead to renal failure and affect the health of the kidney. Moreover, the electrolyte in the body will be diluted by too much water, leading to the danger of electrolyte imbalance.

Many people only pay attention to the amount of water they drink, but ignore that they also consume water in their daily diet. For example, every meal of food, fruit and drink contains water, and three meals account for at least 500 ml. Therefore, you must drink less than 1600 to 1950 ml of water every day, otherwise you will drink too much water, and patients with kidney disease or heart disease even need to limit water to avoid life-threatening.