Pervention had an articular about this http://www.prevention.com/weight-loss/weight-loss-80-percent-diet-and-20-percent-exercise?cid=NL_EUSD_-_091216_WeightLossFraction_hd&utm_source=PVN07&utm_medium=email&smartcode=YN_0000161752_0001569508 This is one of my 27 rules I talked about and follow. The important thing is that the 80% is high nutrition. Make sure it's not just calories you are counting but nutrition.
