You should NEVER go below 1200 calories per day!!! If you take in too few calories at first you will experience alot of rapid WEIGHT loss--meaning only loss of fluids and muscle fiber. That's no good because your body thinks it is starving and slows your metabolism as a result.
Your bod will then start living off of muscle fiber and that is the exact opposite of what you want. Depending on your age, individual metabolism, body structure and activity level, roughly 1200 (for smaller structured or less active people) to even 1800(for larger structured or highly active people) is suitable.
It is really better to measure success by loss of inches as opposed to pounds. If you exercise regularly you will gain lean muscle mass which actually weighs more than fat, but you will see yourself measuring much smaller in inches.
An example of what I do:
I am 25 and 5 foot tall with a very small bone structure. I try to work out often, but my job is sedentary so I'm not buring alot of calories otherwise. My ideal weight for my petite body structure is about 113 pounds. My doc said 1200 calories/day is what I should strive for even when I'm not dieting in order to maintain a healthy weight. When I work out heavily though, I tend to go to about 1500 per day with alot of proteins to help sculpt and build muscle.
Now obvously this wouldn't work for another woman who may be 5'9" with a large bone structure and a more active lifestyle.
If I were you I'd forget those quacks at the so called "weight loss clinic" and check with your family dr. Some weight loss clinics are reputable and are concerned for your health, but it sounds like yours is doing that kind of crap so you'll lose a little weight really fast and think it's working for you so you'll continue to give them $$!!
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