nutrition

Sweet potato tuber contains 60%-80% water, 10%-30% starch, about 5% sugar and a small amount of protein, oil, cellulose, hemicellulose, pectin and ash. If 2.5Kg fresh sweet potato is converted into 0.5Kg grain, its nutritional components are higher than rice and flour except fat. In addition, sweet potato is rich in vitamins (carotene, vitamins A, B, C and E), and its starch is easily absorbed by the human body.

1. carotene

Vitamin A is known as "eye protection", which is transformed from carotene. Sweet potato is rich in carotene, which can provide rich vitamin A. The content of vitamin A can be as high as 40mg/ 100g of fresh sweet potato. Carotene can be converted into vitamin A after being absorbed by human body. Vitamin A can maintain normal visual function.

2. Edible fiber

The fiber content of sweet potato is 10 times that of rice flour. It has fine texture, does not harm the stomach, can accelerate the peristalsis of digestive tract, help defecation, clean the digestive tract, shorten the residence time of toxic substances in food in the intestine, reduce self-poisoning caused by constipation, reduce the concentration of carcinogens in the intestine, and prevent hemorrhoids and colorectal cancer. At the same time, cellulose can absorb some glucose, reduce the sugar content in blood, and help prevent diabetes.

3. Combination of sugar and protein

Sweet potato is rich in mucin, which is a mixture of polysaccharide and protein. It has a special protective effect on human body, and can keep the lubrication of digestive tract, respiratory tract, joint cavity and membrane cavity and the elasticity of blood vessels. Because this substance can prevent arteriosclerosis caused by the deposition of substances on the arterial wall, it can prevent the atrophy of connective tissue of organs such as liver and kidney, slow down the aging of human organs and improve the immunity of the body. Sweet potato also contains glycoprotein, which has good anti-mutation, hypolipidemic and immune enhancement effects.

4. Potassium

Sweet potato has high potassium content, which can alleviate the disadvantages caused by excessive salt intake. Potassium is also an important factor to protect the heart. Because potassium is an alkaline element, the pH value of sweet potato is 10. 1, which is a physiological alkaline food and has the function of neutralizing body fluids. Proper consumption of sweet potato is conducive to maintaining the acid-base balance of blood and to people's health, development and intellectual development.

5. Anticancer substances

There is a physiologically active substance called "deoxyepiandrosterone" in sweet potato, which can prevent colon cancer and breast cancer and greatly promote the activity of brain cells and endocrine glands, so it can delay mental decline and increase human resistance. It contains more carotene, lysine, plant fiber and dehydroepiandrosterone, which can prevent intestinal cancer and breast cancer.

Potatoes:

nutritive value

Generally, fresh potatoes contain starch 9-20%, protein 1.5-2.3%, fat 0.1-1%and crude fiber 0.6-0.8%. The nutritional components in 100g potato are: energy 3 18kJ, calcium 5-8mg, phosphorus 0/5-40mg, iron 0.4mg~0.8mg, potassium 200~340mg and iodine 0.8-/kloc-0.2.

Medicinal value

It can be used to treat stomachache, rib tuberculosis, carbuncle, eczema and scald. It is a traditional Chinese medicine for invigorating stomach and a drug for detoxifying and detumescence. It is mild in nature and sweet in taste.

Chinese medicine believes that potatoes are "sweet and non-toxic, which can strengthen the spleen and stomach, replenish qi and neutralize the middle warmer, relieve pain and relieve constipation." It is effective for patients with spleen and stomach weakness, dyspepsia, gastrointestinal disharmony, epigastric pain and poor stool. "Modern research has proved that potatoes have special effects on regulating indigestion, and they are good medicines and high-quality health care products for patients with stomach diseases and heart diseases. Potatoes are rich in nutrition and are one of the anti-aging foods.

The new dietary guidelines suggest that everyone eat potatoes about 5 times a week, 50 grams each time-100 grams. Potatoes contain as much as 300 mg of potassium per 100 g, which is the most among more than 20 kinds of vegetables and fruits that are often eaten. A Japanese study found that eating 5-6 potatoes a week can reduce the risk of stroke by 40%.

According to foreign research, the antibacterial ingredients contained in potatoes help prevent gastric ulcer. Not only has antibacterial effect, but also does not produce drug resistance.