Caloric Expenditure During Breastfeeding

Energy Requirements and Expenditure

The European Food Safety Authority (EFSA) specifies that exclusive breastfeeding during the first six months requires a mean energy expenditure of 670 kcal/day, based on average milk production of 807 g/day with an energy density of 0.67 kcal/g and 80% energetic efficiency 1
After accounting for maternal fat stores mobilized during lactation, the net additional energy requirement is 500 kcal/day above pre-pregnancy needs 1
A breastfeeding woman requires approximately 500 more kcal/day compared to a non-pregnant, non-lactating woman, with total milk volume averaging 780 mL/day and energy content of 60-70 kcal/100 mL 2

For women with diabetes or those requiring structured meal planning, an energy intake of 1,800 kcal/day typically meets nutritional requirements for lactation while allowing gradual weight loss of 1-2 pounds per month, according to the American Diabetes Association 3, 4, 5
Overweight women may safely lose up to 2 kg/month without affecting milk volume, as recommended by the American Diabetes Association 3

The 500 kcal/day recommendation applies specifically to exclusive breastfeeding during the first six months; energy needs may differ with partial breastfeeding or after six months, as stated by the European Food Safety Authority (EFSA) 1