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 of fresh sweet potato is converted into 0.5Kg of grain, the contents of protein and carbohydrates are higher than those of rice and flour except fat.

Moreover, the composition of protein in sweet potato is reasonable, and the content of essential amino acids is high, especially lysine, which is relatively lacking in cereals, is high in sweet potato.

In addition, sweet potato is rich in vitamins (carotene, vitamins A, B, C and E), and its starch is easily absorbed by human body.

Extended data

Sweet potato (English: sweet potato), scientific name: sweet potato (Ipomoea batatas (L.) Lam.), also known as sweet potato, red taro, sweet potato, sweet potato, sweet potato, sweet potato, sweet potato, sweet potato (north), sweet potato (in many local languages), sweet potato, sweet potato and sweet potato.

Sweet potato belongs to the order of tubular flowers, panicum miliaceum, Convolvulaceae, with a length of more than 2 meters, lying on the ground obliquely, the leaves are usually broadly ovoid, 4-13cm long and 3-13cm wide, the corolla is pink, white, lavender or purple, bell-shaped or funnel-shaped, 3-4cm long, and the capsule is ovoid or oblate.

Sweet potato is rich in protein, starch, pectin, cellulose, amino acids, vitamins and various minerals, and has the reputation of "longevity food". The sugar content reached 15%-20%. It has anticancer, heart protection, emphysema prevention, diabetes, weight loss and other effects. In the Ming Dynasty, Li Shizhen's Compendium of Materia Medica recorded that "sweet potato can tonify deficiency, strengthen spleen and stimulate appetite, and strengthen kidney yin", and said that people in the sea eat long. Chinese medicine regards sweet potato as a good medicine.

reference data

Baidu encyclopedia-sweet potato