After verification, experts on femoral head necrosis found that sweet potato contains a lot of potassium and magnesium, which can maintain the ion balance in the body and slow down the calcium loss caused by age. Sweet potato also contributes to calcium absorption in patients with femoral head necrosis.

Sweet potato is the most popular healthy food in recent years. The calorie of sweet potato is only 1/3 of that of rice with the same weight, and it contains almost no fat and cholesterol. It is a good low-fat and low-calorie food.

At the same time, it can effectively prevent sugar from transforming into fat, which is beneficial to the weight control of the elderly. In addition, sweet potato contains a lot of dietary fiber, which can effectively stimulate intestinal peristalsis and secretion of digestive juice, and reduce the incidence of intestinal diseases.

However, sweet potato lacks protein and lipids, so it should be eaten with vegetables and fruits to avoid nutritional imbalance.

Patients with femoral head necrosis had better eat sweet potatoes at the prime time of lunch. This is because after we eat sweet potatoes, the calcium contained in them needs to be absorbed in the human body for 4 to 5 hours, and the afternoon sunshine can just promote the absorption of calcium. In this case, eating sweet potatoes for lunch can completely absorb calcium before dinner, and it will not affect the absorption of calcium in other foods at dinner.