The safest way to lose weight, and keep it off, is to "cut" or burn-off 500 calories a day. 500 less calories daily equals about a pound a week weight loss. It's okay to go as much as 2 pounds a week, but that is maximum rate at which humans can burn fat!!! If you lose more than 2 pounds in a week you are putting your health at risk! The human body cannot safely lose more than 2 pounds in a week. If you have lost more weight than that, it wasn't fat. Hopefully it is just "water," but you could be losing bone mass, muscles, or even vital organ tissue! (YIKES!!!)
You don't need to restrict yourself so much!! I keep my daily calories between 1500 - 2000. It keeps me from feeling "deprived," and I keep losing weight! Slow and steady is the way to win this race!!!
WARNING: The human body MUST consume at least 1,200 calories a day to avoid neurological problems and other serious health risks associated with malnutrition.