Weight loss help/tips

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hi! My name is Lynne. I'm a 61 year old woman and since I started with Nutrisystem in February of this year i have only lost 10 pounds. Any suggestions on how I can start losing again? My exercise level is high. They set my calorie level at 1200. My metabolism at this point is negative 0, or at least I feel like it is. Thanks! I've switched meals around, etc. and that's not working either.