Why do some people itch when touching yam, and some people don’t?
There is a substance called saponin in the mucus of yam. This is an allergen. When the skin of the body comes into contact with this substance, the receptor in the nerve ends will tell the nerve to "itritic", and then allergic reactions will occur, causing itchy, pain and even redness and swelling.
However, each person's immune cells are different, and the nerves do not react slightly. Some people have a little lazy immune cells, thick skin and thick flesh, and the nerves do not react slightly slowly, so the reaction will be weaker, or even none.
Some people have abnormally sensitive nerve cells and their skin is very sensitive. As soon as they come into contact with yam mucus, they will immediately have a strong itching reaction, resulting in redness and swelling of the skin.
Also, people who often deal with yam, or the yam mucus only touches the palms, but do not touch the skin on the wrist, back of the hand, or fingers, etc. Because there is a transparent layer on the palms that play a protective role, it is not easy to itch.
So whether the hand itch will itch when dealing with yam will depend on the situation. Not everyone will feel itchy or not.
How to avoid itchy hands when treating yam?
1. Put on gloves to treat;
2. Wash the yam skin, then steam it directly in the pot, and then peel off the skin with your hands. This can reduce the chance of allergies and allow you to enjoy the yam food.
3. First, blanch the yam with boiling water and then peel it.
Is yam a good stomach-nourishing product?
Yam has always been considered a good health product for benefiting the spleen and stomach, and this is based on certain scientific basis.
The starch contained in yam is small in size, with a large surface area, and there are many small pores on the surface, which is conducive to the amylase in the body to enter starch granules , so it is easy to digest. Moreover, the content of amylopectin in yam starch is also high, which also destined that yam is very easy to digest.
Experimental studies have shown that after yam is fully gelatinized, the increase in blood sugar after meals is the highest among various potato and grains, which shows that yam can stimulate more digestive enzyme to help speed up digestion.
So yam is very suitable for people with bad stomachs and can relieve stomach discomfort to a certain extent.
, and animal experiments have also proved that yam can promote the rapid proliferation of epithelial cells in the digestive tract mucosa, thereby increasing the thickness of the small intestine mucosa and improving the activity of digestive enzymes in the small intestine. In addition, yam contains less crude fiber and will not cause too much irritation to the stomach and intestines, so it is very suitable for people with stomach disease or digestive tract diseases.
In short, yam is indeed a good food for nourishing the stomach. It can strengthen the spleen and stomach and will not cause mechanical damage to gastrointestinal cells.
