What is the quickest weight loss people have experienced?
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Anything lost very quickly is likely to be through dehydration as opposed to burning stored fat. …which means it’s not sustainable.
Generally accepted guidelines for safe and effective weight loss are 0.5 to 2.0 pounds a week. With one pound being about 3,500 calories, that’s a caloric deficit between 1,750 and 7,000 calories to attain that loss.