Know the water in your body

01The proportion of water in the human body

Water is like air, and the water we drink is indispensable not only to human beings, but to every living thing on Earth。Water content in the body varies according to age and gender, with fetal water accounting for 90% of body weight, newborns accounting for 80%, adults accounting for about 70%, and the elderly accounting for 50%-60%。Women have a slightly lower proportion of water in their bodies because they have more fat。

In other words, a baby's skin contains a lot of water and is therefore elastic。The amount of water the skin contains decreases with age。Skin begins to age at 25。The so-called aging can be said to be the process of gradually disappearing water in the body。According to calculations, with the aging of the human body, the body will have close to 1/10 of the body weight of water disappeared, the skin began to dry, and wrinkles。And women lose twice as much water as men, so the skin loses more water。Hydration is a big problem for women who want to stay young forever。

02Which part of the human body loses water easily？

So, which part of the body loses water as we age？

55% of the water in the body is inside the cells, and the remaining 45% is in the intercellular material。As we age, the amount of water in the intercellular material gradually decreases。If the water in the cell disappears, the concentration of electrolytes such as sodium ions will rise and the person will not be able to survive。In fact, when the concentration of electrolytes in the cell exceeds 38%, the cell cannot sustain life。As a result, there is little change in the amount of water inside cells even as we age。

Recently, collagen has been in the spotlight because of its use in cosmetics。It has been proven that collagen is an important substance in keeping skin young。That's because what binds cells together are collagen fibers, which form the scaffolding for intercellular material。Inside the scaffold is a substance called mucopolysaccharide, which plays an important role in the relationship between human aging and water。

03The secret of skin moisture

Mucopolysaccharides in the human body are macromolecular substances with molecular weights up to thousands to millions, which contain the following types。Among them, the largest molecular weight is called hyaluronic acid, which has a large amount of water absorption function。One gram of hyaluronic acid holds 6 liters of water。

As mentioned earlier, skin dries and wrinkles because there is less water between the cells。Specifically, hyaluronic acid, which holds a lot of water, decreases as the body ages。After the decrease of hyaluronic acid, other mucopolysaccharides, which are not easy to absorb water, began to increase, and the space vacated by the decrease of water was occupied by fat。Hyaluronic acid contains many of the joint fluids that lubricate the joints. It also forms the vitreous body of the eyeball。Thanks to hyaluronic acid, which is rich in water, joints and eyes can move freely。