What percentage of weight is a healthy weight loss per week or month?

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by Earthworm
Question by em: What percentage of weight is a healthy weight loss per week or month?
I know most sources say to lose 2lb per week. But I think the number should vary depending on the person's weight, or at least BMI index.
Yet I can't find any sources giving me this info.
So what percentage would be OK for someone overweight?
Anyone can point me in the right direction, please?


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