how many calories in a day

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Hi, i joined about a month ago. I have been working out and not eating any fast food or junk food. But I am only eating anout 900 calories a day. I read that if I dont eat more it can make my metabolism worse. I eat when I am hungry but just try to stay low fat andcalories. This week I hhaven't lost anything? Please help I really need to loose this weight.

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