Yam tonifies the kidney, strengthens the spleen and moistens the lungs. It can stimulate the intestine, increase intestinal peristalsis and produce purgative effect. The two effects are diametrically opposite and should not be taken together.

2, yam can not be eaten with alkaline food.

Yam contains tannic acid, and at the same time with alkaline food, acid-base reaction will cause abdominal pain, nausea, vomiting and other symptoms. Alkaline foods are mainly divided into: 1, vegetables and fruits; 2. Algae; 3. Nuts; 4. Cereals and beans that have sprouted.

3, yam and pig liver can not be eaten together.

Yam is rich in vitamin C, and pig liver contains trace elements such as copper, iron and zinc. When vitamin C meets metal ions, it will accelerate oxidation and damage, which reduces the nutritional value. Therefore, it is not suitable to eat yam after eating pig liver.

4. Yam and cucumber can't be eaten together.

Cucumber contains vitamin C-decomposing enzyme. If it is eaten with yam, the vitamin C in yam will be decomposed and destroyed.

5. Yam and pumpkin can't be eaten together.

Pumpkin contains vitamin C-decomposing enzymes. If it is eaten with yam, vitamin C will be decomposed and destroyed, thus reducing the nutritional value of yam.

6. Yam and squash can't be eaten together.

Cucurbita moschata contains vitamin C-decomposing enzymes, and yam is rich in vitamin C. If Cucurbita moschata and yam are eaten together, the vitamin C in yam will be decomposed and destroyed, which will lead to the reduction of the nutritional value of yam.