Eat carrots – they will improve your vision. Don’t shave if you can help it – it makes the hair grow back thicker. Wait 30 minutes after eating to swim or you’re in more danger of drowning. Old wives’ tales like these, which aren’t always accurate, are responsible for more bad practices from patients than you’d realize. And while a lot of people know some of these well-meaning but misguided pieces of advice shouldn’t be adhered to, there is one myth that persists in the collective conscious – “Feed a cold, starve a fever.” Maybe it persists because it’s half true – let’s talk about which half you should follow and what the right practice is for the bad advice in this old adage.