How does my body work?

[Reasonable]

WessleWoggle said:

Reasonable said:
In strange and mysterious ways.

Also, according to Wii Fit, your body can change weight by 2.5 pounds or more during one day, so I guess maybe it's not that mysterious.

After a week of not paying attention I usually gain 5 pounds, not loose it. Maybe my metabolism is better.

TBH, my weight always seem to change in ways that surprise me.  I run 5K every 2 to 3 days, cycle and work out 'gently' with weights, stretching excercies, etc. and when I least expect it I seem to gain pounds and when I think I should be losing weight I might gain a few pounds.

Damn mysterious, but probably nothing to worry about so long as you feel healthy and the weight change isn't extreme relative to your lifestyle.