is good to loose 1,000 calories per day?

because i'm doing exsercise with the step machine and is pretty good you sweat a lot plus i eat less than 1,000 calories couse i drink my slim fast optima shake pluse my salad and all that i cut alot of the carbs is there a problem? because my doc. told me i have to loose 12 lb by next month so i'm pumping a lot jajajaja

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