What are some low-calorie nutritious foods that are a must in a breastfeeding mother’s diet?

take a look at this link to find out a host of healthy and low calorie foods http://www.mayoclinic.org/healthy-lifestyle/weight-loss/multimedia/low-calorie-foods/sls-20076175 but make sure you are eating healthy when you are breastfeeding. trust me, you will be able to reduce your weight once you complete breastfeeding. just stay away from fried and greasy foods as well as processed foods :)