How much weight should I lose per month ideally to lose fat permanently?

Anonymous
How much weight should one lose per month so that it does not come back EVER, or for permanent weight loss?

I am currently 5'6 and 140 lbs and trying to lose 15 lbs.

How many months would that take if I lost weight safely and smartly?
How much weight should I lose per month ideally to lose fat permanently?
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