Sweet potato leaves, that is, the tender leaves at the top of the stems of sweet potatoes after they mature in autumn. The experiment showed that every 100 grams of fresh sweet potato leaves contained 2.28 grams of protein, 0.2 grams of fat, 4. 1 g of sugar, 2.3 mg of potassium 1.6 mg of iron, 34 mg of phosphorus, 6.42 mg of carotene and 0.32 mg of vitamin C. Compared with ordinary vegetables, the contents of minerals and vitamins were superior, and the content of carotene was even higher than that of carrots. Therefore, the Asian Vegetable Research Center listed sweet potato leaves as a high-nutrient vegetable variety and called them "vegetable queens". Studies have found that sweet potato leaves have health care functions such as improving immunity, stopping bleeding, lowering blood sugar, detoxifying and preventing night blindness. Regular consumption can prevent constipation, protect eyesight, keep skin delicate and delay aging. In recent years, there has been a "sweet potato leaf fever" in Europe, America, Japan and Hong Kong. Food made from sweet potato leaves has even been put on the tables of hotels and restaurants. In China, there are no sweet potato leaves in city supermarkets. It is a pity that farmers throw sweet potato leaves and stems in the ground after harvest, or use them as feed for livestock. There are many ways to eat sweet potato leaves. Here is a brief introduction. Select fresh and tender leaf tips, blanch them with boiling water, and season them with sesame oil, soy sauce, vinegar, Chili oil, mustard and ginger juice. , to make cold salad, the appearance is light green, which can make people's appetite open. You can also cook sweet potato leaves in soup or put them in porridge. There are canned pickled sweet potato leaves for sale in Japanese market, and we can also add salt to make pickles and side dishes for auxiliary consumption.
The disadvantage of sweet potato is the lack of protein and lipids, but today people are rich and no longer take sweet potato as their staple food, and their lack of nutrients can be supplemented by other diets.
Sweet potato contains much more lysine than rice and white flour, and is also rich in carotene, which can promote the normal maturation of epithelial cells, inhibit the abnormal differentiation of epithelial cells, eliminate oxygen free radicals with carcinogenic effect, prevent carcinogens from combining with protein in the nucleus, and promote human immunity.
Eating sweet potatoes should be scientific, otherwise it will be difficult to digest after eating, and there will be abdominal distension, heartburn, burping, pantothenic acid, exhaust and other discomfort.
Anticancer effect
Recently, medical workers in China conducted a survey on the hometown of centenarians in western Guangxi, and found that all the longevity elders here have a common feature, that is, they are used to eating sweet potatoes every day, and even regard sweet potatoes as their staple food.
Coincidentally, the list of 20 anti-cancer vegetables recently published by the National Cancer Research Center of Japan is: sweet potato, asparagus, cauliflower, cabbage, broccoli, celery, eggplant, pepper, carrot, cauliflower, rape, kohlrabi, mustard, mustard seed and tomato.
Komatsu, onion, garlic, cucumber, etc. Among them, sweet potato ranks first. Japanese doctors found that the cancer inhibition rate of cooked sweet potatoes (98.7%) was slightly higher than that of raw sweet potatoes (94.4%) through a dietary survey of 260,000 people. The hospital in Philadelphia, USA also extracted an active substance-androsterone from sweet potato, which can effectively inhibit the occurrence of colon cancer and breast cancer.
Sweet potato is not only a healthy food, but also a good medicine for treating diseases. According to Compendium of Materia Medica, sweet potato has the effects of "tonifying deficiency and benefiting qi, strengthening spleen and stomach, and strengthening kidney yin". "Sweet potatoes are steamed, cut into sections, dried, and harvested as food, which is called potato food, which makes people live longer and less sick." Compendium of Materia Medica says that sweet potato can tonify the middle energizer, enrich the blood, warm the stomach and nourish the five internal organs. The Manual of Sweet Potato says that it has six medicinal values: treating dysentery and diarrhea; Treat wine accumulation and heat diarrhea; Treating damp-heat jaundice; Treating nocturnal emission with white turbidity; Treating blood deficiency and menstrual disorder; Treat infantile malnutrition. "Lu Chuan Materia Medica says that sweet potatoes can produce fluid to quench thirst and cure fever and thirst.
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. In addition, its rich β -carotene is an effective antioxidant, which helps to eliminate free radicals in the body. In fact, 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.
Is Chinese medicine medicine?
Sweet potato tubers come in different colors of white, yellow and lavender. It is cultivated all over China. Take it in winter, wash it, remove the fibrous roots and use it fresh, or slice it and dry it in the sun for later use.
[Attribute] Sweet in taste and flat in nature. It can invigorate the spleen, invigorate qi, moisten the intestines, relieve constipation, promote fluid production and quench thirst.
[Reference] Contains sugar, vitamin C, carotene (red skin and yellow heart potatoes contain more) and other ingredients.
【 Usage 】 Used for spleen deficiency and constipation; Lung and stomach fever, dry mouth.
[Usage] It is suitable for both raw and cooked, and there are various ways to eat it.