The main effect of losing weight while breastfeeding is that it leads to a decrease in milk production and a lack of fats, proteins and nutrients in the milk, making it less nutritious. The main method of scientific and healthy weight loss is moderate diet control and physical activity. Through diet control, the total calorie intake in food can be reduced and the root cause of obesity can be eliminated. Through sports, you can increase the consumption of calories in your body and promote the decomposition and metabolism of body fat. However, excessive dieting during breastfeeding can easily lead to reduced milk and thin milk, which affects the baby’s development. So you can lose weight during breastfeeding, but not over dieting. When diet control is carried out for weight loss during breastfeeding, lactating mothers only need to avoid the intake of processed foods such as hamburgers, pastries, instant noodles and ham sausages, avoid eating animal fatty foods, and do not overly restrict the general diet, such as chicken soup and fish soup.