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I eat mostly meat as I don't really care for veggies.
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Are you getting enough fat in your diet? If you're eating, say, boneless skinless chicken breasts, you may not be getting enough fat.

One other thing you could look at -- how many calories are you consuming a day? I'm 5'4", so even on Atkins, I can't eat 2,500 calories a day and lose weight. I can eat enough to be satisfied, but I still have to look at my calorie count.

I hope this helps. In time you will find out, through trial and error, what works for you.