"I never itch when I touch yam."

Sister Chen was cooking, and there was no salt at home, so she came to borrow some from Sister Zhang. When she first entered the kitchen, she saw that she was processing yam.

Sister Zhang said that her son has a bad stomach and often tries to nourish his stomach. It is said that yam can nourish the stomach, so her family often eats yam. But to Sister Chen's surprise, Zhang Dajie doesn't need to wear gloves when handling yam, but every time she accidentally touches the yam hand, she itches badly. She always thought that everyone's fingers would itch when they touched yam, but I didn't expect anyone not to, so she felt very puzzled. How to treat this yam differently?

Sister Zhang doesn't know what's going on Anyway, she has always treated yam like this and never felt itchy. What happened?

When cooking, you always need to wear gloves when washing yam, otherwise your hand skin will be itchy, red and swollen, and stinging. Actually, this is an allergy.

Because the mucus of yam contains saponin, which is a common allergen, if human skin comes into contact with it, it is easy to cause contact dermatitis, itchy fingers and even tingling and redness, which is normal.

However, the time of allergic symptoms generally varies from person to person. Some people will react quickly, their hands will itch immediately, and some people will be allergic after a while. Generally speaking, people with sensitive skin will have a strong itching reaction after touching yam mucus, while people with rough skin will have a weak or even no such reaction. Sister Zhang's skin may be thick, and she often touches yam. It is not easy to itch after touching yam. In addition, if the yam mucus only touches the protective transparent layer on the palm of your hand, rather than the skin such as wrist, back of hand and fingers, it is not easy to itch. Therefore, it depends on the situation whether cutting yam will make one's fingers itch. Not everyone has an itch.

Speaking of stomach-nourishing food, yam can definitely occupy a place. Traditional health preservation also thinks that high-quality yam is beneficial to the spleen and stomach, which has been confirmed by scientific research to some extent.

From the nature of starch, yam contains starch with small particle size, large surface area and many surface pores, which is beneficial for amylase to enter starch particles and digest. In addition, the starch of yam contains more amylopectin, which means that yam will be very easy to digest. Laboratory studies have found that when yam is fully gelatinized, the rising speed of postprandial blood sugar is the highest among all kinds of potato grains, which means that yam can stimulate the digestive system of human body to produce more digestive enzymes to improve the digestion speed.

Therefore, people who have a bad stomach can really relieve stomach discomfort to a certain extent by eating yam.

In addition, the study of living animals found that yam can promote the proliferation of epithelial cells of digestive tract mucosa, increase the thickness of intestinal mucosa and improve the activity of digestive enzymes in small intestine, so it is very beneficial for patients with digestive system diseases to eat yam. In addition, yam has low crude fiber content and fine texture, which will not cause great irritation to the gastrointestinal tract.

So yam can strengthen the spleen and stomach. Even people suffering from gastrointestinal mucosal injury need not worry that eating yam will cause mechanical damage to gastrointestinal cells. It is a good food for nourishing the stomach.

Yam is a mild food. According to modern medical research, yam contains amylase, mucus, choline, free amino acids, glycoprotein, vitamin C, carbohydrates, fat, calcium, phosphorus and iodine. Regarding the efficacy of yam, there are mainly the following aspects:

First of all, yam contains enzymes and dietary fiber, which can promote digestion, improve gastrointestinal function and reduce gastrointestinal burden. Moreover, the dietary fiber in yam is beneficial to weight control. Compared with steamed bread, noodles, rice and other staple foods, yam has higher dietary fiber content, which can increase satiety and control weight.

Secondly, mucin in yam has the function of protecting blood vessels, because polysaccharide protein can prevent fat from depositing on the blood vessel wall, help blood vessels to maintain elasticity, and thus prevent atherosclerosis.

Finally, yam polysaccharide can activate phagocytes, effectively scavenge free radicals and help delay aging.

Yam is rich in nutrition, and its cooking methods are varied. Fried yam, as a highly nutritious food, is the most nutritious. You can cut yam into shreds or slices and fry them in a pot, so that the short-term heating method will not affect the nutritional components in yam, especially reduce the loss of vitamin C, such as yam fried auricularia, yam fried pork slices, yam fried diced chicken, tomato fried yam, yam fried kidney flower, yam fried shrimp and so on.

Although yam is rich in nutrition, it is not suitable for patients with prostate cancer, breast cancer and constipation. Because yam contains an ingredient called dioscin, which can synthesize hormones such as estrogen and testosterone in the human body, it is not suitable for patients with prostate cancer and breast cancer. In addition, yam is rich in starch. People with dry stools, full chest and abdomen, and constipation had better eat less, and then eat yam after constipation symptoms are relieved.

Yam nourishes people. People who are suitable for eating yam can try to eat yam often to nourish the stomach.

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