In hot summer, it is inevitable to make people sweat. If you sweat more, your body will be dehydrated easily. You should replenish a lot of water to avoid the concentration of body fluids. Many studies have confirmed that when people are short of water, they are prone to fatigue, have difficulty in concentrating, and their working ability is obviously reduced. For the elderly, water shortage is one of the causes of many diseases. However, the composition of sweat is very complicated. Besides water, there are many minerals such as sodium, potassium, calcium and magnesium, many B vitamins and vitamin C, and a small amount of amino acids and soluble protein. -Sweat is easy to ferment and stink, precisely because the protein and vitamins in it provide sufficient nutrition for bacteria. Although protein lost from sweat is not much, other minerals and vitamins are trace substances, so it is easy to feel inadequate in the diet. If you sweat a lot and run away, it will inevitably aggravate the problem of malnutrition, which will make people feel tired and irritable in summer and reduce their body resistance. Look at boiled water, pure water and mineral water first. They can really let water enter the human body quickly, but they will reduce the electrolyte concentration in the blood and reduce the osmotic pressure. In this way, water will quickly turn into sweat and urine to be excreted, and at the same time take away a variety of nutrients. Obviously, if you only use white water as a drink, but when you sweat a lot, other nutrients are easy to be lacking and can't help your body keep hydrated. Look at all kinds of sweet drinks in the street. Almost all of these drinks contain sugar, among which the sugar content of low sugar is 3-6%, and the sugar content of sweet sugar is about 10%, so it is easy to get fat if you drink too much. Many of them have added vitamin C, but almost no B vitamins. The metabolism of sugar in the body needs to consume B vitamins. Therefore, drinking a lot of sweet drinks will even aggravate the problem of vitamin B deficiency. The mineral content in this kind of drinks is also insufficient, and potassium and calcium are also easy to be lacking when sweating a lot. In contrast, low-sugar, decaffeinated drinks are more conducive to hydration. They will not obviously interfere with water absorption while supplementing sugar; However, the osmotic pressure of sweet drinks is too high, which is not conducive to water absorption and delays gastric emptying. So, what about all kinds of sports drinks? They add a lot of sodium and potassium, some also add magnesium and calcium, and even nicotinic acid and vitamin C. However, none of them contain vitamins B 1 and B2. Why? Because these two vitamins are not good in taste and color. So they still can't solve the problem of sweating and losing B vitamins in summer. At the same time, sports drinks need to maintain a reasonable osmotic pressure and sodium ion concentration in order to replenish water efficiently. However, at present, the contents of various minerals on the labels of sports drinks vary greatly, and there is no commitment to stabilize the osmotic pressure level, so it is difficult to rest assured of the effect of replenishing water and salt. Fruit juice is rich in potassium and sugar, but the sugar content is too high, while the sodium content is too low and the B vitamins are insufficient. After drinking a lot, stomach discomfort may occur. Tea is rich in potassium and a small amount of B vitamins and vitamin C, which is better than boiled water. However, the contents of minerals and vitamins in light tea and flower and fruit tea are still insufficient, and the osmotic pressure is low, while the strong tea contains caffeine, which has diuretic effect and is not conducive to the maintenance of water in the body. As for caffeinated refreshing drinks, we dare not expect them. Because they contain high concentrations of caffeine, drinking more will aggravate the dehydration problem. Caffeine can also increase calcium excretion. Don't choose alcoholic beverages, because they are also diuretics and will aggravate the lack of B vitamins. Or bean soup with a little salt (red bean soup, mung bean soup, black bean soup, etc.). ) has a good heatstroke prevention and hydration effect, can supplement a variety of minerals and vitamins, and can avoid the adverse effects caused by high sugar.