Mothers all around the world produce very ample milk on very inadequate diets. You don't need to eat perfectly when you breastfeed. The best rule of thumb is to “eat to hunger.” Most moms find that they gradually lose the extra weight they gained during pregnancy that way. Rather than eating the extra calories needed for milk production, they use their fat stores (what a concept.). Still, a healthy diet will increase your energy, help your immune system, and give baby a great example for making healthy food choices as she grows.