Re: how much weight loss?

Be very careful about rapid weight loss- any weight loss much over about 500g / 1lb simply can't be fat. If you lose weight fast on a fast(!) then the live body mass will be more likely muscle and organ tissue than fat - but most of what you lose will be water.

An average human using say 2200 calories a day will burn 550g (~1lb) if it is just protein (i.e. your muscle) or carb at 4 calories per g, OR 250g (~1/2lb) if it is just fat (9 calories per g). So about 350g or 3/4 lb if both. That is why a safe and healthy target is no more than 250g or 1/lb a day. Short term you can use fasting to conquer hunger and give yourself a kick start, but is is bad for you longer term.

You can only lose fat through burning to CO2 & water, so the only way it leaves your body is from breathing and peeing. You breathe out fat.

You lose basically about 1/50th gram per breath (cheating there because that includes the water), so you take an awful lot of extra exercise to have those extra breaths.

To lose 1500g or 3lb on a fast would need 10 hours non-stop jogging to lose another 4000 calories, and your body can't do that every day on fat alone.

But

Bottom line is anything much more than 500g / 1lb a day can't be fat.
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