Our expert says:
Did you weigh yourself on the same scale?
That would be the obvious answer - differences in the calibration of the scale.
The only other explanation is acute fluid mass, caused by losing fluid one day, drinking more the next. In other words, the first day you weighed yourself, you might have been 1 L of fluid short, and the next day, you have had a cup or two of water, you get a swing of 2kg.
I'd say it's an error in the scale though, or in what you are wearing, because there isn't a physiological reason for it.
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