The main purpose is to soak the starch out of the potatoes, because potatoes contain a lot of starch. The purpose of soaking the potatoes is to isolate the potatoes from oxygen, so as to prevent the starch from interacting with oxygen and becoming It becomes dark and black;

Extended information:

Nutritional analysis of potatoes:

1. Hezhong nourishes the stomach, strengthens the spleen and removes dampness: potatoes contain a large amount of Starch, protein, B vitamins, vitamin C, etc., can promote the digestive function of the spleen and stomach;

2. Broaden the intestines and laxative: Potatoes contain a large amount of dietary fiber, which can relax the intestines and help the body to excrete and metabolize in time. Toxins, prevent constipation, and prevent the occurrence of intestinal diseases;

3. Reduce blood sugar, lipids, and beautify the skin: Potatoes can supply the human body with a large amount of mucus protein that has special protective effects. It can promote the lubrication of the digestive tract, respiratory tract, joint cavity, and serosal cavity, prevent cardiovascular and systemic fat deposition, maintain the elasticity of blood vessels, and help prevent the occurrence of atherosclerosis. Potatoes are also an alkaline vegetable, which is beneficial to the acid-base balance in the body and neutralizes the acidic substances produced after metabolism in the body, thereby having certain beautifying and anti-aging effects;

4. Supplementing nutrients and diuresis Reduce swelling: Potatoes are rich in vitamins and trace elements such as calcium and potassium. They are easy to digest and absorb and are rich in nutrients. In European and American countries, especially North America, potatoes have long become the second staple food. The potassium contained in potatoes can replace sodium in the body and excrete sodium from the body, which is beneficial to the recovery of patients with hypertension and nephritis and edema;

5. Antihypertensive effect: Potatoes can lose weight, maintain blood vessel elasticity, It has functions such as excretion of sodium and preservation of potassium, which is beneficial to patients with hypertension.

Reference: Baidu Encyclopedia-Tudou