Suffering through a stopped nose and a fuzzy brain, when asked what words of wisdom speak to me, the best and brightest gem that floats to the top is:
Starve a cold, Feed a fever.I know, that's not "wisdom" per se, but it has stuck.
For the longest time, I couldn't keep it straight in my head which got starved, but then a few years ago I read something about cold remedies. Ahem, ahem, ahem...
A COLD is a virus. Viruses love the sugar your body turns food into. Eating sugar or simple carbs that turn into sugar is bad.
A FEVER means that your body is fighting off an infection of some sort. Your body uses energy to do this, so it needs you to fuel it appropriately.
Should you fast when you're sick? Of course not. But I like this logical way to think about it: eat less to feed a virus, but keep your body fueled for a fever.