If you plan to use protein shakes for weight loss while breastfeeding, make sure they provide a good amount of protein and don't include a high amount of sugar. Here are some low or no-sugar options to try: - Optimum Nutrition Protein Shakes - Pure Protein Complete Protein Shake - Iconic Protein Drink - Quest Nutrition Protein Shakes - Naked Juice Protein Shakes Just remember, nursing moms need at least 1500-1800 calories per day to maintain an adequate milk supply.