BMR is your basic metabolic rate. It's the calories you burn just by resting for 24 hours. To lose weight, you eat less than your BMR to create a calorie deficit .. that's your BMR minus 500 to lose 1 pound per week. 500 calories x 7 days = 3500 calories per week.
Your doctor already said to go on a 1000 calorie diet to lose 2 pounds per week. So he estimated your BMR to be about 2000. The 2 pounds per week is there at a 7000 calories per week deficit.
Exercise shouldn't be used to create an even bigger deficit. You exercise to build lean muscle, boost your metabolism, and keep your body from adapting to your calorie deficit. MFP tells you how many calories you burned and adds them to your calorie allowance so you can eat them and keep your muscles fueled.
Go to the MFP forum and search for "700 calories a day and not losing". It's really long but a true story about a 185-pound woman who could not lose weight even though she was only eating 700 calories per day. How? Because she was only eating 700 calories per day!
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