Houston we have a problem!
150 calories a day would starve a cat!
When your brain gets the message that you have reduced calorie intake (and nutrients) to this level, your brain starts to gear up for starvation mode. It really doesn't matter how much you weigh or how you look. Your brain thinks,"No food comming in, start the rationing on the inside."
Your body's reaction is to conserve what it has. Your metabolism slows, you burn less calories, your body starts to get it's nutrients from the inside, when it needs protein, if it can't find it in the amounts it needs from what you eat, it takes it from the muscles. Like the heart the legs the arms etc. When it can't get the minerals and vitamins, like calcium, it takes it from your bones making them smaller and weaker. And on and on.
Eating a balanced diet is important to maintain a healthy body. The trick to holding your weight is to burn more calories than you consume. A big muscle will burn more calories than a small muscle, a toned muscle will even burn calories when it is a rest, while you sleep. You have to eat a balanced diet to keep your metablism working at it's peak, then, you will see the benefits of modifying your diet to get the look you want, by controlling the type of nutrients you give your body.
Your body is like a fruit tree. Give it all the nutrients, in the appropriate balance and you will have a healthy tree that will give you fruit for many years to come. Starve it and all you will have is a sickly tree that will not bear fruit.
The secret lies in what you put in, not how much.
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Getting Fat. 
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