Calories correctly counted?

[GrayBenham]

I am a 58 year old male. I was 15 stone seven at the beginning of the year, now I'm 12 stone six.

My fitbit says I burn 4000 calories a day and I never have more than 1500 a day but yet I put weight on?

I walk on average 21000 steps a day and cycle for 30 mins a night minimum.

Surely the weight loss should be levelling off?

[JohnnyRow]

Since beginning of year, you've gone from 15 stone 7 to 12 stone 6.  I don't use stones but to me that sure looks like you are losing weight, not gaining, unless stones are an inverse weight or some such.

First you say you put weight on; but then say weight loss should be leveling off.

I don't understand at all.

[Heybales]

With that kind of extreme deficit I'd be shocked that your body isn't adding a bunch of stress water weight.

If that has been going on awhile I'm sure your body has already adapted to the extreme diet and you actually are not burning 4000 anymore.

You probably don't even realize how poorly the cycling workout is probably going, as far as ability to be intense with it - but perhaps you are doing it merely to burn calories anyway and not actually trying to improve fitness or muscles, so no loss except accuracy of calorie burn.

You don't say how much the weight increase was or over how many days.

Water weight.

Fat is not fast gained or lost.

Water is.

Sadly muscle mass loss is actually a tad faster than fat loss (gain is much much slower than fat gain) - which I'm pretty sure if that deficit was anywhere near reality for a time, you lost some.