Your body will go into starvation mode. You won't lose nearly as much weight as you might imagine. You may lose 5 or 10 pounds. I used to be anorexic. Once you drop to an outrageously low number of calories, the body starts storing all the fat.
Have you lost a lot of weight recently? Is this your first go at trying to lose the 20 pounds? If you drastically change your eating habits (without severe calorie restrictions), you will drop about 5 to 10 pounds in the first two weeks. After that, you can lose about 2 pounds a week if you consume approximately 1100 calories and exercise regularly. You could lose about 15 to 18 pounds this way, theoretically.
But seriously, restricting that much won't help the pounds come off as quickly as you might think.
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