Why am I not losing weight?

I've been eating 800 calories a day and running two miles everyday for exactly a week. I've stepped on the scale this morning after my morning run and haven't lost a single pound ??? How is that possible if I am burning 500 calories a day?? Also I been taking garcinia prime pills. Is that causing weight... show more I've been eating 800 calories a day and running two miles everyday for exactly a week. I've stepped on the scale this morning after my morning run and haven't lost a single pound ??? How is that possible if I am burning 500 calories a day?? Also I been taking garcinia prime pills. Is that causing weight gain?
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