Layne Norton is a renowned prep/physique coach and pro natural bodybuilder/powerlifter. Layne has his PhD in Nutritional Sciences with his thesis emphasis in muscle protein metabolism.
The link below will direct you to his video discussing the data about low calorie diets and why they set people up for rapid weight regain and why they could actually lead to metabolic adaptations that push you towards increased fat accumulation over time.
CLICK HERE for the Video – Is your diet making you fatter?
http://ajcn.nutrition.org/content/94/6/1399.full.pdf+html
http://ajpregu.physiology.org/content/290/6/R1577.full.pdf+html