I have read all over the internet that it takes 1200 (or more) calories/day to keep the body from going into starvation mode and lowering its metabolism. However, I have visited the Center for Medical Weight Loss and their 6-week program has patients consuming 800-900 cal/day (and from what I understand they do not change their plan based on the patients base metabolic rate). It seems like they've had good results with this, so are they really having their patients lower their metabolism on this diet? If so, their patients are losing weight slower than if they consumed a bit more food (since starvation mode makes the metabolism about 40% slower according to what I've read). Their plan also includes an appetite suppressant with B12 vitamins and other ingredients that give a person more energy. Is it okay to eat less when taking a supplement to boost your metabolism, thus making this program work? I want to know why these doctors believe that 800 cal is a magic number and why the general public believes that 1200-1500 is. If you answer, please include a website or source with some credibility.