Purple potatoes more than 14 years old and children and adults eat 50~100g a day is appropriate, 7~13 years old children eat 25~50g a day is appropriate, 6 years old and 6 years old children under the age of a day moderate consumption can be. Purple potatoes belong to potato food, rich in dietary fiber, according to the “Dietary Guidelines for Chinese Residents” recommended consumption, adults should consume 50~100g of potato food per day, if the meal also consume potato or sweet potatoes and other potato food, it should also be calculated in the total amount of potato food. 7~13 year olds can consume up to 25~50g of purple potatoes per day, and children aged 6 years old and below should consume a moderate amount of food, not more than Children aged 6 years and below should consume a moderate amount, not more than 25g. Purple potatoes are rich in dietary fiber, can promote gastrointestinal tract peristalsis, constipation patients, pregnant women and infants and young children moderate consumption of purple potatoes is good for the body. As purple potatoes contain more sugar, so patients with diabetes should not eat too much purple potatoes, so as not to cause blood sugar fluctuations.