Eat a lot of purple potatoes have the following disadvantages: excessive exhaust, indigestion, malnutrition reaction, the details are as follows: 1. Excessive exhaust, purple potatoes, if you eat a lot of words, will be in the human gastrointestinal tract decomposition and thus produce a lot of gas, slowly into the gastrointestinal tract will lead to excessive exhaust symptoms, if you eat a lot of purple potatoes every day, then the phenomenon of exhaust may often occur. 2. indigestion, purple potato itself contains a lot of starch and fiber, in the gastrointestinal tract is not easy to be digested, if a large number of eating purple potatoes, easy on the gastrointestinal tract to bring the burden, which leads to indigestion, may also appear bloating, stomach pain symptoms, so it is recommended that you do not eat a lot of purple potatoes, moderation is good. 3. Malnutrition, if you just eat sweet potatoes for a long time without eating with other foods, it is likely to become nutritionally unbalanced, resulting in malnutrition, so in addition to eating purple potatoes, you should also match other foods, such as meat vegetables and fruits.