Many people think that potatoes contain more starch and little nutrition, and it is easy to get fat if you eat too much. In fact, potato is a low-calorie and low-fat food. The calorie per1000g of potato is only about 20% of the same amount of rice or flour, and the fat content is about 7% of rice or flour. In addition, protein contained in potato is better than soybean, which is a kind of plant protein closest to animal protein. In recent years, studies have proved that eating potatoes often can also prevent the occurrence of stroke. This is mainly because potatoes are rich in potassium. Potassium is mainly distributed in cells in human body and has important physiological functions, which can maintain the osmotic pressure in cells, participate in the process of energy metabolism and maintain the normal excitability of neuromuscular. People with potassium deficiency are prone to cerebral vascular rupture and stroke. In addition, the crude fiber in potatoes can play a role in relaxing bowels. When constipation people hold their breath hard to relieve constipation, their blood pressure will suddenly rise, which is also an important cause of stroke. Potatoes also contain a substance similar to invertase, which has the same effect as antihypertensive drugs and can relax blood vessels and lower blood pressure. According to Indian medical experts, as long as a person insists on eating an average of 5-6 potatoes a week, the risk of stroke will drop by 40%.