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Women should not consume less than 1,200 calories a day," Brownell cautions. In fact, a diet below 1,000 calories a day (called a very low-calorie diet or VLCD) increases your risk for gallstones and heart problems and should be followed only by obese people under a doctor's supervision.

Fast weight reduction is unsustainable. Although it's recommended that you create a calorie deficit of 500 to 1,000 calories a day to reduce 1 to 2 pounds a week, this rate may be too aggressive for some people. If achieving that rate requires extreme deprivation, it's unlikely you can stick to the plan.

Consuming 500 calories a day is not a healthy diet. Normally, eating anything below 1200 calories per day will make your body assume there's a food shortage. The end result will cause your body to go into what is known as "Starvation Mode". During this mode, your metabolism will slow down and try to conserve energy.

Skip it! Jumping rope burns more than10 caloriesa minute while strengthening your legs, butt, shoulders, and arms. And it doesn't take long to reap major rewards. You can burn more than200 calories in two, 10-minute sessions each day (that's 1,000 calories a week)!

You can eat a salad at McDonald's for an under-300 calorie meal, but most fast food customers are ordering the high cal classics burgers, chicken nuggets, fries and chasing them down with cokes and milkshakes. We've rounded up some easy ways to down 1,000 calories in one sitting at 9 major fast food chains.

In one month you can reasonably anticipate losing eight to 10 pounds if you follow a pretty strict plan. Losing one pound of body fat is equivalent to 3,500 calories. To lose two pounds per week, you must drop 1,000 calories per day.