There is no which six kinds of people should not eat yam, but allergy to yam, constipation, dampness and abdominal fullness and other people are not recommended to eat. 1. Allergy to yam: Although rare, some people may have an allergic reaction to some of the ingredients in yam, and are prone to systemic allergic reactions, such as itching, redness and swelling, after eating it. People who are allergic to yam should avoid eating it. 2. constipation: yam in the starch content is more, eat too much easy to cause indigestion, resulting in bloating, dry stools, etc., may lead to constipation aggravation. 3. Dampness fullness: In the concept of Chinese medicine, dampness fullness (too much dampness leads to fullness and discomfort in the spleen and stomach) or people with stagnation should not eat yam alone, and those who have real heat and evil spirits should be cautious. If you eat yam after discomfort, it is recommended to seek medical attention to avoid affecting your health.