I was wondering this too - they say even the smallest of adults should stay at or above 1200 calories. I'm a small person, and even if I'm running a calorie deficit, it doesn't go under 1200 or I really start to feel it in terms of weakness and crankiness too.D
Did your nutritionist tell you to drop to 1000cal a day? If you drop below 1200cal a day your body is at risk of going into survival mode. It will hold onto fat in order to survive.
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