Carbs do not make you gain weight.
Sparkpeople bases its recommendations on USDA guidelines, and isn't a diet at all! It's DEFINITELY not a low-carb diet. It's about balanced living for life. YOu don't need to eat low carb to lose weight, in spite of what the low-carb book writers will try to tell you.
The Truth About Carbohydrates www.sparkpeople.com/resource/nutrition_art
As for breastfeeding, you do need more calories; it's about 500 more calories per day. I'm not sure who "they" are in this case, but you can most assuredly eat more than 150g carbs per day and lose weight. :)
Edited by: DRAGONCHILDE at: 2/14/2013 (14:02)