The sweet potato mentioned by northerners is called sweet potato in Guangdong. Many people think that eating sweet potatoes will make people fat. But the opposite is true. Sweet potato is actually an ideal diet food. Its calorific value is only 1/3 of that of rice. Contains active substances that inhibit the conversion of sugar into fat, and is rich in cellulose and pectin substances that are not dissolved by digestive enzymes. I feel full after eating, and it is not easy to overeat.

A dietary survey of 260,000 people by the National Cancer Research Center of Japan found that the cancer inhibition rate of cooked sweet potatoes was 98.70%, and that of raw sweet potatoes was 94.4%. Because both raw food and cooked food can effectively inhibit the formation of human cancer, sweet potato ranks first among 20 kinds of anticancer vegetables in Japan. The National Aeronautics and Space Administration of the United States listed sweet potato as a necessary food for astronauts. The Philadelphia Medical College in the United States extracted an active substance called androsterone from sweet potato, which can effectively inhibit the occurrence of colon cancer and breast cancer.

In addition, because sweet potato is rich in magnesium, phosphorus, calcium, vitamins and linoleic acid, it is especially beneficial to middle-aged and elderly people, which can keep blood vessels unobstructed and prevent atherosclerosis.

PS: Although sweet potato is a good food to lose weight, we should eat this kind of food with high starch content properly during weight loss, and it is best to eat it at noon, because the sunshine in the afternoon will help the absorption of vitamin D in sweet potato.