11 weeks in, 10lbs down but...

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I am eating the calories needed to lose 2lbs a week...so am I barely losing 1lbs a week? Sometimes I have fluctuated and ate the 1.5lb a week calorie intake.I am VERY grateful for the 10lbs...I went over 2yrs with not being able to lose an ounce but still...I can't go any lower in calories so I am a little frustrated that the weight loss is so low. I thought with a lot of weight to lose (50lbs) that the weight loss would be a little quicker in the beginning. I watch my protein and carbs so not sure what else I can do except be patient.