Because most people of any culture can't stick to restrictive diets [1]. Restricting calories is ultimately the goal - how you do it is largely irrelevant, outs

Because most people of any culture can't stick to restrictive diets [1]. Restricting calories is ultimately the goal - how you do it is largely irrelevant, outside of eating mostly whole, unprocessed foods. When you apply further restrictions, people (up to 66% of them) rebound and gain the weight back (or more). [1] http://www.ncbi.nlm.nih.gov/pubmed/17469900 http://www.ncbi.nlm.nih.gov/pubmed/17469900