Why am I not losing weight at 300-400kcal a day? I'm 5'2, 20 years old, and weigh around 129- 127lbs/59-57kg. I check the scale every day?

Why am I not losing weight at 300-400kcal a day? I'm 5'2, 20 years old, and weigh around 129- 127lbs/59-57kg. I check the scale every day?
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