Lemon contains a large amount of citric acid, so it is known as the "storage of citric acid". The fruit of lemon is very juicy and with rich fragrance. But because of the extremely sour taste of lemon, so it is always used as a fine seasoning for the preparation of drinks, dishes, cosmetics, medicines, and so on.

Lemon is not only very nutritious, but also has a lot of effects to human body. First of all, lemon contains a large number of nicotinic acid and organic acids. Citric acid has a strong bactericidal effect, so it is good for the hygiene of the food. Experiments have showed that lemon juice can kill all the bacteria in the marine shells within only 15 minutes.

Secondly, lemon has sweet fragrance, so it can remove the bad smell of meat and aquatic products, and can make the quality of the meat much more delicate. What's more, lemon can also promote the secretion of enzymes in the stomach, so as to break down the proteins, and increase the peristalsis of the intestines and stomach.

Thirdly, lemon juice contains a large amount of citrate, which can inhibit the crystallization of calcium salt, thereby preventing the formation of kidney stones. In addition, even the stones which have already formed can also be dissolved away. As a result, eating lemon can prevent kidney stones, so as to reduce the number of people who suffer from chronic kidney stones.

Fourthly, eating lemon can also prevent cardiovascular disease, promote blood clotting, prevent and treat hypertension and myocardial infarction, etc. Citric acid has the effects of contracting and reinforcing the capillaries, decreasing the permeability, promoting the function of coagulation, and increasing the number of platelet.

Last but not the least, fresh lemon is extremely rich in vitamins, so it is a natural and best food for skin beauty. It can prevent and eliminate the pigmentation on the skin, and has a whitening effect. As a result, lemon is an ideal fruit for women.

In general, lemon is suitable for most people. But because of its extremely sour taste, so it is not appropriate to eat fresh lemon. Instead, it can be used in dishes or be made into juice.

Although lemon has the effect of invigorating the spleen and promoting the digestion, while it is not suitable for people who suffer from gastric ulcer and hyperacidity. What's more, patients who suffer from dental caries and diabetes also should not eat lemon.