Originally Posted by Badunk
I'd be wary of over-thinking things, mate. A brief bout of illness will not cause you to lose a ton of muscle. It takes a lot of effort to add muscle and it is just as hard to lose it. If the average trainee adds 0.5-1 lb of muscle A MONTH, you aint gonna lose shitloads coz you had flu (or whatever it is you had). You probably just lost a lot of water weight from dehydration.
I was under the impression that as weird as it sounds, dehydration causes water retention? But that might be in a healthy state.
It's probably a mixture of losing water weight, losing some fat and a mental thing as well though. When you don't go to the gym and stop gaining you automatically feel like you're getting smaller. You're bound to lose a bit from not eating very well and your body being preoccupied with fighting the illness though.
I'd love to find out my bf%.