2, leek contains volatile propylene sulfide, so it is spicy and has the effect of promoting appetite. The bulbs of garlic, onion and other plants also contain propylene sulfide volatiles, which can resist cold, sterilization and influenza. When eating leeks, these volatiles have a certain stimulating effect on the stomach, so they cause indigestion.
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The main nutritional components of leek are vitamin C, vitamin B 1, vitamin B2, niacin, carotene, carbohydrates and minerals. Leek is also rich in cellulose. Every100g of leek contains1.5g of cellulose, which is higher than that of scallion and celery. It can promote intestinal peristalsis, prevent the occurrence of colorectal cancer, reduce the absorption of cholesterol, and play a role in preventing and treating arteriosclerosis, coronary heart disease and other diseases.
Although leek has many benefits to human body, it is not the more the better. "Compendium of Materia Medica" once recorded: "Eating more leeks makes you dizzy, especially after drinking." According to modern medicine, people with hyperactivity of yang and febrile diseases should not eat it. Leek has a lot of crude fiber, which is not easy to digest and absorb, so you can't eat too much leek at a time, otherwise a lot of crude fiber will stimulate the intestinal wall and often cause diarrhea. It is best to control the meal 100~200g, not more than 400g g.
Leek is a happy and worrying food for many people. I like its taste, but I'm worried that my stomach will be uncomfortable after eating it. There is a famous saying in Zhou Qing of Southern Qi Dynasty: "Early leek in early spring, late autumn", and this "leek" is naturally leek. The quality of leeks in early spring is the best, followed by late autumn and the worst in summer. There is a saying that "spring food is fragrant and summer food is smelly".
Leek is also called yangcao, which tastes very delicious and has a unique fragrance. The unique pungent smell of leek is formed by its sulfide, which has certain bactericidal and anti-inflammatory effects and helps the human body to improve its immunity.
These sulfides in leek can also help the human body absorb vitamin B 1 and vitamin A, so it is a more nutritious way to eat leek if it is matched with pig meat food rich in vitamin B 1. However, sulfide is volatile when heated, so it is necessary to stir-fry the pot quickly when cooking leeks. If you heat it a little too much, you will lose the flavor of leeks.
References:
Baidu encyclopedia entry? Chinese chives