Nutritionists point out that consuming 100 grams of red-fleshed sweet potatoes daily can meet the human body's requirement for vitamin A. As a physiologically alkaline food, sweet potatoes can effectively balance the body's acid-base levels, contributing to physical strengthening and health preservation. In addition to being rich in dietary fiber, sweet potatoes also contain mucoprotein, which can prevent fat deposition in the cardiovascular system, maintain blood vessel elasticity, and prevent atherosclerosis. Sweet potatoes are also an ideal food for weight loss; the same quantity of sweet potatoes contains only one-third the calories of rice. Moreover, they are rich in cellulose and pectin, which have the special function of preventing sugar from being converted into fat.
Purple sweet potatoes are a new variety that has emerged in recent years. The anthocyanins in purple sweet potatoes have significant antioxidant effects and are very effective in slowing down the human aging process. The content of lysine, copper, manganese, potassium, and zinc in purple sweet potatoes is 5 to 8 times higher than in ordinary sweet potatoes. Particularly, the content of cancer-fighting substances iodine and selenium is more than 20 times higher than in other sweet potatoes, ranking first among foods.