if you're mainly on fluids, of course do your juices and glycal electrolytes, but also try to run some reeally heavy viscous ( either reeally thick protein shakes and light ( maybe 1/2 water ) milks through your body and doo that with either a cheesey pasta or some good wholemeal meat sandwhiches and what shoould happen is that the gastric should cause thaat to be what you loose instead of the virus taking too much out of your own mass, so that when you come out of it, what you should experience is a feeling of good musculature but less dense .. to rememdy thaat, if you hit some good proteins once you're over the heavy stripping part of the illness, as in shakes and meats ( that will also restore your blood), then you should bounce back in maybe even better shape than before you got ill.
cheers.
Blooming Lotus.