The potato has many affectionate names; the French call it the "underground apple"; the Germans call it the "ground pear"; and the Russians call it the "second bread". In China, the potato is also known by many endearing names: people in the Northeast call it "tudou" (potato), people in the Northwest call it "yangyu" (foreign taro), people in the North China region call it "shanyao dan" (mountain yolk), and people in the Jiangsu-Zhejiang area call it "yangfanyu" (foreign taro).
Nutritional analysis shows that the protein and Vitamin B1 in potatoes are equivalent to 10 times that of apples, the fat is 7 times that of apples, the Vitamin C is 3.5 times that of apples, Vitamin C2 and iron are 3 times that of apples, and phosphorus is 2 times that of apples. The sugar and calcium content are comparable to apples, with only the carotene content being slightly less than that of apples.
From a nutritional perspective, the nutritional value of one kilogram of potatoes is approximately equivalent to 305 kilograms of apples. In recent years, potatoes have also become a popular weight-loss food in Europe and America.