I have heard both side on eating and not eating exercise calories back. I do not lose weight very fast at all, so the past 2 months I have not been eating my exercise calories back and the scale hasn't budged too much, but it never really does anyway. I think starting in July I am going to starting eating at least half of my exercise calories back to see if it makes a difference. With PCOS, our bodies already are broken from all the hormone imbalances and crap like that, we may never be able to stick to always eating our exercise calories back or not eating them. We might always need to keep modifying things. Good luck and I know I didn't answer your question, but hopefully someone else responds with a more definite answer.