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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.

A healthy eating plan: Emphasizes vegetables, fruits, whole grains, and fat-free or low-fat dairy products. Includes lean meats, poultry, fish, beans, eggs, and nuts. Limits saturated and trans fats, sodium, and added sugars. Controls portion sizes.

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.

For breakfast, you may eat 1/4 cup Maple-Nut Granola, 3/4 cup plain non-fat Greek yogurt, and 1/2 cup blueberries. You may consume 1 clementine for morning snack. For lunch, you may have 1 whole-wheat pita round (6-1/2-inch), 1 Tbsp. mustard, 1/2 medium apple, sliced, 1 oz. Cheddar cheese, and 1 cup mixed greens. You may consume 1/2 medium apple fo

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.

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.