1, matters needing attention in baking sweet potatoes
1. Baking sweet potatoes with coal will produce toxins.
Most of the baked sweet potatoes sold on the street are baked with coal, and when coal is burned, it will produce a lot of sulfur dioxide and carbon oxide, as well as toxic substances such as arsenic. After the sweet potato is baked in this way, it is easy to be polluted by the above toxic substances. People who eat the polluted sweet potato are easy to be poisoned, and in severe cases, their digestive and respiratory systems will be damaged. In addition, because most street baked sweet potato stalls have no sanitary facilities, baked sweet potatoes are easily polluted for the second time.
2. The oven for baking sweet potatoes may be a barrel of chemical raw materials.
Most of the baked sweet potato stoves on the street are made of discarded iron drums, some of which are gasoline drums or diesel drums, and some are chemical raw material drums. Because these iron drums have not been thoroughly disinfected, the sanitary conditions cannot be guaranteed. However, there are still many chemicals left in some iron drums, most of which are harmful to human body. After being baked in an iron drum at high temperature, sweet potatoes will absorb many chemicals in the drum. Eating such baked sweet potatoes will do harm to the respiratory tract and nervous system.
3. Black spots on sweet potatoes are harmful to human body.
Now some vendors who bake sweet potatoes will bake sweet potatoes with black spots as good ones and sell them. This is harmful to people who eat sweet potatoes. According to experts, sweet potatoes infected with black spot bacteria will excrete two toxins, namely sweet potato ketone and sweet potato ketone alcohol, which will make raw sweet potatoes hard and bitter, and cannot kill black spot bacteria by boiling, steaming or roasting with fire. After roasting this sweet potato with brown and dark brown spots, the original obvious black spots will no longer be obvious and ordinary people can't recognize it at all. Some people will have vomiting, diarrhea and other symptoms after eating black-spotted sweet potato, and in severe cases, they will have high fever, asthma, convulsions, vomiting blood, coma and even death. Therefore, people who eat black-spotted sweet potatoes by mistake should immediately induce vomiting or induce diarrhea, and those who have severe poisoning symptoms should be sent to the hospital for treatment.
Experts suggest that people who often eat street baked sweet potatoes should be alert to the above three hazards. For your health, eat street baked sweet potatoes carefully. If you really like baked sweet potatoes, you might as well make them yourself. You can go to the supermarket to buy fresh and clean raw sweet potatoes with smooth skin, and then bake them in the microwave oven. A raw sweet potato weighing half a catty will be cooked in 15 minutes. This baked sweet potato is reassuring to eat.
2, the efficacy of sweet potato
1. Nourish liver and kidney and help the body recover. Sweet potato can improve the function of digestive organs, nourish liver and kidney, and restore the weakness of the body, which can effectively treat hepatitis and jaundice.
2. Sweet potato has anticancer effect. The most anticancer nutrients in the diet are β -carotene (precursor of vitamin A), vitamin C and folic acid, and the contents of all three are relatively rich in sweet potatoes. Rich lysine and carotene can promote normal maturation of epithelial cells, inhibit abnormal differentiation of epithelial cells, eliminate carcinogenic oxygen free radicals, prevent carcinogens from combining with protein in the nucleus, and promote the enhancement of human immunity.
3. Sweet potato is 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-fat oxidation and prevention of atherosclerosis. Folic acid and vitamin B6 are helpful to reduce the content of homocysteine in blood, avoid damaging arterial blood vessels and eliminate the risk factors of cardiovascular diseases.
4. laxative. Sweet potato contains a lot of cellulose and pectin that are not easily destroyed by digestive enzymes, which can stimulate the secretion of digestive juice and gastrointestinal peristalsis, thus playing a laxative role.
5. Enhance resistance, promote desire and delay aging. Sweet potato contains vitamins C and E with special properties, that is, only the vitamins C and E contained in sweet potato will have special properties that will not be destroyed at high temperature. Among them, vitamin C can obviously enhance the body's resistance to several viruses such as colds, while vitamin E can promote desire and delay aging.
Step 6 lose weight. Sweet potato is also an ideal diet food. It contains less calories, only one-third of the calories produced by the same weight of rice, and contains no fat. Therefore, eating sweet potatoes often is beneficial to human health and has a certain weight loss effect.