It generally takes about 24 hours for what you eat to be metabolized out of breast milk, but the exact metabolism time varies depending on the type of food and the amount of milk, for example, hard-to-digest food may take a longer time to be metabolized out of breast milk. What a breastfeeding mother eats will not exist in the breast milk immediately, it needs to be absorbed through the digestive tract, then enter the bloodstream, and then metabolized before it finally reaches the breast milk and is secreted through the breast milk, so this is a continuous process, which usually takes about 24 hours to complete. However, if you eat some hard-to-digest food, such as fried chicken, coffee, etc., the whole process will take longer time to complete. Therefore, the exact metabolism time will vary depending on the type of food. To summarize, breastfeeding mothers can reasonably choose whether to breastfeed or not and the time of feeding according to the kind of food they eat, so as to promote the normal growth of infants and young children.