There is no particular diet you have to follow when you are breastfeeding. I would just keep eating a balanced diet-just like you always did before. When you are nursing you burn 500-1000 extra calories a day! (this depends on the individual) So it makes sense that you are hungry and need more calories. I focus on LOTS of raw fruits and veggies, nuts & seeds, a variety of whole grains, tofu, soy or regular yoghurt, nut butters, flax, beans...I dont actually make an effort to meet all food requirments every day. I just keep nutrient dense foods on hand and eat a fair share everytime I am hungry. My favorite snack right now is a peanut butter and jelly sandwich on whole grain bread with a fruit smoothie on the side. (made with fruit and soymilk) This fills me up really well. If I am hungry soon after I gorge on fruit or veggies. Sometimes I just sit and eat carrot after carrot or I lean over the sink and eat 8-10 ripe nectarines. I always have a bag of nuts or seeds open so I can snack throughout the day. For dinner we always plan something really healthy and dense. My body takes the hint.