Never eat fewer than 1200 calories in a day or restrict your calories by more than 550 per day
. Your body will go into "starvation" mode and your metabolism will slow down dramatically. When you begin to eat more, your body will be more likely to store what you eat, causing you to gain weight fast.There are two things the body requires that have no calories: water and fiber. The more of these you consume, the better for you and your weight loss goals. Many vegetables are full of both: this is why a one pound package of salad mix has only 100 calories or so.