The main reason purple potatoes are not recommended for weight loss is because they are relatively high in starch. 100 grams of purple potatoes contain 133 calories, including 31.7 grams of carbohydrates, 1.2 grams of protein, 0.3 grams of fat, and 2.5 grams of fiber. Most of the calories in purple potatoes come from carbohydrates, with less protein and fat. Weight loss period is generally not recommended to eat too much food with high starch content, because starch is easy to be converted into glucose under the action of enzymes after intake into the human body, which is converted into fat, which will have a certain impact on the effect of weight loss, too much to eat is also prone to lead to obesity. During the weight loss period should eat more food rich in dietary fiber, such as celery, spinach, cucumber, oatmeal, but also appropriate intake of some coarse grains, such as buckwheat, oats, etc., can promote intestinal peristalsis, help defecation and fat content is relatively small. Weight loss people usually also pay attention to eat less high-fat and high-sugar foods, such as fat meat, animal offal, cream, cake and so on.