The calorie intake and milk production are related to each other because milk is produced from the energy of food.
The purpose of the difference in caloric needs between milk production and the recommended energy intake for a breastfeeding woman is to ensure the availability of suitable amount of milk for lactation. Milk is produced in women by the use of food as an energy source.
So we can conclude that calorie intake and milk production are related to each other because milk is produced from the energy of food.
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