Effect of the macronutrient composition of the high-carbohydrate (H-CHO) and the high-fat (H-F) diets on daily energy expenditure (EE), EE plus milk energy output, maternal calorie intake, and daily energy balance. Results are presented as means ± SEMs for 7 subjects. *, **The statistical evaluation of the data was performed by using a paired Student's t test: *P < 0.05, **P < 0.01.