Malnutrition in pregnant women is considered to be related to excessive dieting, picky eating, eating indigestible food and other factors. It is recommended to have a diversified diet or to take nutritional supplements under the guidance of a doctor. 1. Excessive dieting: After pregnancy, weight gain is relatively fast, and some women are worried about poor post-partum recovery, so blind dieting may lead to malnutrition. It is recommended to diversify the diet and give a variety of fresh fruits and vegetables, various porridges and soups, which can supplement the nutrition. 2. Picky eaters: In the early stages of pregnancy, it is easy to have a pregnancy reaction, resulting in reduced eating and unbalanced nutrition. It is recommended to have moderate activities to enhance appetite and give various kinds of nutritious food to supplement. 3. Eating indigestible food: Frequent consumption of sweet, greasy and fatty food may lead to loss of appetite and malnutrition. It is recommended to eat a light diet and, if necessary, give pregnant women milk powder, vitamins, iron and calcium supplements under the guidance of a doctor. It is recommended to eat a reasonable diet during pregnancy, do not be partial to picky food, pay attention to nutritional supplements, which is conducive to the development of the mother and fetus.