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Is there any truth behind this phrase? I was always skeptical and figured that the body needed energy from food to fight whatever illness it may have.

I have even heard people say it in reverse: "Feed a fever, starve a cold"!

So which is it?

Feed a fever and a cold;

Feed a fever, starve a cold;

Feed a cold, starve a fever;

or

Starve a fever, starve a cold?

  • 1
    got a cold right now, and was searching for exactly this. – JoseK Nov 5 '11 at 10:45
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From the Albert Einstein Healthcare Network:

For the claim:
A Dutch research team conducted a small, preliminary study that provides some indirect support for the old myth. They found that the subjects’ immune systems responded differently under the conditions of feeding versus starvation.

While these are intriguing findings, they say little about how a person suffering from a cold or a fever can expect to actually feel when fed or starved. Although the study was small and inconclusive, the idea that food consumption may have a short-lived effect on the immune system is a new one, as previous studies have focused on more long-term effects.


Against the claim:
Current medical opinion puts the “feed a cold, starve a fever” maxim in the same category as other medical advice from the Middle Ages–false and maybe even dangerous!

An infection–particularly one associated with fevers– is no time to deny your body the nutrients and fluids it needs. Like any bodily system, the immune system requires energy to function properly.


Whether you’re thirsty or not, drink plenty of fluids. And, if you’re hungry–eat!


From Duke Health:

Although a few small-scale studies have suggested that “feed a cold, starve a fever” loosely represents sound medical advice, Duke medical experts caution against putting too much faith in the adage.


From the European Food Information Council:

You do not need to do either. Instead it's better to follow your appetite, although if you are sweating a lot [...] it is really important to increase your fluid intake to avoid becoming dehydrated.

The stress of illness can increase protein demands.
Other important nutrients needed for the production of "germ-gobbling" cells in the immune system are zinc (in seafood and red meat) plus folic acid and pro-vitamin A (beta carotene) in broccoli, spinach and carrots.


More Sources that say the claim has little merit:

  • But what happens when your cold gives you a fever? Oh yeah, spontaneous combustion! – Monkey Tuesday Jun 21 '11 at 4:48

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