This is not the case! If you consume too few calories you will actually send your body into a tailspin that can contribute to weight gain as opposed to weight loss. You will end up in a mode of starvation.
If a message is sent to your brain that you do not have enough to eat and are starving, this will cause your metabolism to slow down a great deal. This does not facilitate weight loss at all.
According to weight loss experts, diets that are as low as 800 to 1,000 calories per day are dangerous, unhealthy and will lead to weight loss failure. If your body thinks it is suffering from a famine, then it immediately kicks into gear to protect you and will not make it easy to get rid of excess weight.