Experts pointed out that it is best to eat sweet potatoes at lunch time. This is because after we eat sweet potatoes, the calcium contained in them needs to be absorbed in the human body for 4 to 5 hours, and the afternoon sunshine can just promote the absorption of calcium. But it is best to eat sweet potatoes before lunch, so that calcium can be completely absorbed before lunch, and it will not affect the absorption of calcium in other foods at dinner.

When we process sweet potatoes, we must steam them thoroughly, which will destroy the cell membrane of starch, because it is difficult to digest. In addition, if the gasification enzyme in sweet potato is not destroyed by high temperature, we will feel uncomfortable after taking it.

Raw sweet potatoes after germination are forbidden to eat. The sweet potato at this time is called Phoenix Potato, which is highly toxic. In rural areas, farmers used to feed raw sweet potatoes after bud removal to pigs and cows, and pigs and cows died of poisoning.

1, not suitable for eating sweet potatoes with black spots. The virus in the black spot of sweet potato with black spot is not easy to be destroyed and killed by high temperature, and it is easy to cause poisoning, resulting in a series of poisoning symptoms such as fever, nausea, vomiting, diarrhea and even death.

2. Sweet potato should not be eaten with persimmon at the same time. The main ingredient is starch. After eating, it will produce a lot of fruit acid. If eaten with persimmon at the same time, fruit acid can condense with persimmon tannin and pectin to form gastrolith. If you eat too much, it should be at least five hours apart. If you feel upset in the stomach, you must go to the hospital for gastroscopy to see if there is stomach bleeding or gastric ulcer.

Be sure to eat thoroughly.

Sweet potatoes must be steamed before eating, because the starch particles in sweet potatoes are not destroyed by high temperature and are difficult to digest. Sweet potato contains an oxidase, which easily produces a large amount of carbon dioxide gas in human gastrointestinal tract. Eating too much sweet potato will make people bloat, burp and fart.

Eat sweet potato "heartburn" with small pickles

Sweet potato has a high sugar content. Eating too much will stimulate gastric acid secretion and make people feel heartbroken. Therefore, it is best to eat sweet potatoes with a little pickles, which can effectively inhibit stomach acid.

Be careful to eat sweet potatoes for indigestion.

Sweet potato has a lot of sugar, which can't be absorbed by the body for a while, and the rest is easy to ferment in the intestine, making the abdomen uncomfortable. Chinese medicine believes that people with dampness blocking the spleen and stomach, qi stagnation and blood stasis should be careful to eat sweet potatoes.

Sweet potato and persimmon should not be eaten together.

Sweet potato and persimmon should not be eaten at the same time in a short time, at least five hours apart. If eaten at the same time, the sugar in sweet potato will ferment in the stomach, which will increase the secretion of gastric acid and precipitate and condense with tannin and pectin in persimmon to produce lumps. When the amount is serious, it can cause gastrointestinal bleeding or gastric ulcer.

Medicinal value

Medicinal efficacy:

Sweet potato tubers contain active ingredients, which have the effects of anti-cancer, heart protection, prevention of emphysema, diabetes, weight loss, beauty and so on, and have the reputation of "longevity food".

Sweet potato contains unique bioflavonoids, which can promote defecation and effectively inhibit the occurrence of breast cancer and colon cancer; It can improve the function of digestive organs, nourish liver and kidney, and effectively treat hepatitis and jaundice. [ 1 1]

Sweet potato protein is of high quality, which can make up for the lack of nutrition in rice and white flour. Regular consumption can improve the utilization rate of nutrients in staple food, make people healthy and prolong life.

Sweet potato is rich in dietary fiber, which has the special function of preventing sugar from transforming into fat; Can promote gastrointestinal peristalsis and prevent constipation. Can be used for treating hemorrhoid and anal fissure, and has certain effect on preventing rectal cancer and colon cancer.

Sweet potato has a special protective effect on the mucosa of human organs, which can inhibit the deposition of cholesterol, maintain the elasticity of blood vessels, prevent the atrophy of connective tissue of liver and kidney, and prevent the occurrence of collagen disease.

External use:

Potatoes are used to treat sores, while local records uses leaf juice to treat eczema, and vines are used to treat snake and dog bites. Potato seedling leaves, tender leaves of Ipomoea aquatica and brown sugar are applied to the navel for treating nephritis edema and ascites due to cirrhosis. Brazilian sweet potato Simon 1 is the most effective variety in clinical application, and there are some difficult cases such as treating cancer and 17 type diabetes. [ 12]

Lose weight, beauty:

Whether eating sweet potatoes can make people fat. According to scientific research, eating sweet potatoes will not make people fat. On the contrary, sweet potato is an ideal diet food. Its calories are very low, much lower than ordinary rice. You don't have to worry about getting fat after eating it, but you can lose weight.

Sweet potato also contains a substance similar to estrogen, which has a certain effect on protecting human skin and delaying aging. So many foreign women regard sweet potato as beauty food.

Anticancer:

Scientists have found that sweet potato contains a chemical called hydroepiandrosterone, which can be used to prevent colon cancer and breast cancer. The most anticancer nutrients in the diet are β -carotene (the precursor of vitamin A), vitamin C and folic acid, and the contents of the three are rich in sweet potatoes.

A small sweet potato (about 2 times) can provide twice the daily vitamin A, one third of the daily vitamin C, and about 50 micrograms of folic acid. The content of dietary fiber is higher than a bowl of oatmeal. Eating sweet potatoes regularly helps to maintain the normal folic acid level of the human body, and low folic acid content in the body will increase the risk of cancer. Sweet potato has high dietary fiber content, which can promote gastrointestinal peristalsis and prevent constipation and colorectal cancer.

It's good for the heart

Sweet potato is rich in potassium, beta-carotene, folic acid, vitamin C and vitamin B6, all of which help to prevent cardiovascular diseases. Potassium contributes to the balance of liquid and electrolyte in human cells and maintains normal blood pressure and heart function.

β -carotene and vitamin C have the effects of anti-lipid oxidation and prevention of atherosclerosis. Supplementation of folic acid and vitamin B6 is helpful to reduce the level of homocysteine in blood, which can damage arterial blood vessels and is an independent risk factor for cardiovascular disease.

Prevention of emphysema

Why some long-term smokers live to be over 90 years old without suffering from emphysema may be related to the rich vitamin A content in their daily diet. Researchers suggest that smokers or passive smokers should eat some foods rich in vitamin A every day, such as sweet potatoes, to prevent emphysema. [ 1 1]

Anti-diabetic effect

Japanese researchers found that the blood insulin level of diabetic obese rats decreased by 26% and 60% respectively after eating white sweet potato for 4 weeks and 6 weeks. It is found that sweet potato can effectively inhibit the increase of blood sugar level in diabetic obese rats after oral glucose. Eating sweet potato can also reduce the levels of triglycerides and free fatty acids in diabetic rats.

It is suggested that sweet potato with white skin has certain anti-diabetic effect. A clinical study at the University of Vienna in Austria found that insulin sensitivity of patients with type 2 diabetes mellitus was improved after taking sweet potato extract, which helps to control blood sugar.

Sweet potato soup can lose weight;

Coarse grains are rich in dietary fiber. After entering the intestine, they can clean up the waste in the intestine, collect toxins and waste, and let them be excreted smoothly. Sweet potato is also rich in dietary fiber, especially vitamins, which can make new cells in the intestine and promote metabolism.