From Folklore to Fluids: Rethinking the Old Saying When Sickness Comes Calling

There’s a phrase many of us have heard whispered over cups of tea and bowls of soup: “Feed a cold, starve a fever.” It sounds simple, almost folkloric — a piece of shared wisdom passed down like a favorite warm blanket. Such sayings often take root because they offer comfort when we feel at our weakest: sniffles, chills, or a burning brow under a blanket. But in the unfolding narrative of modern medicine, this old adage is showing its age. Rather than a rulebook for how we care for ourselves when sick, it’s more like a relic from a time when understanding of the body was shaped as much by observation as by science.

Today’s experts agree that the saying doesn’t hold up scientifically — not in its original form, and not in the simple way it’s often repeated. Both colds and fevers are usually caused by infections, which demand energy from the body’s immune system as it mounts a defense. Whether you’re battling a common cold or running a fever, your body’s metabolic processes are working overtime. That means your immune system needs energy, nutrients, and especially fluids, regardless of whether your temperature is high or low.

The historical explanation for the phrase goes back centuries. In the 1500s, people believed that eating raised body heat, which would help counter a cold’s chill, while avoiding food might help cool someone down during a fever. But our understanding of illness has evolved. We now know that a cold is caused by viruses and that a fever is often the body’s natural way of fighting infection — increasing temperature to slow pathogens and rally immune cells. In both cases, hydration is crucial, because colds, fevers, and bodily defenses all draw on your body’s water reserves.

When you feel sick, appetite changes are part of your body’s response. It’s common for people to feel less hungry during a fever, not because they should avoid food, but because the immune system alters hunger signals — a phenomenon sometimes called sickness behavior. Even so, restraining food intake intentionally is not recommended; instead, experts say, eat if you can, drink plenty of fluids, and choose nourishing, easy-to-digest foods like broth, soups, fruits, and simple proteins.

So what should you do when a cold or fever comes along? Modern advice is gentle and rooted in listening to your body. Rather than forcing extra meals during a cold or depriving yourself during a fever, focus on staying hydrated, getting rest, and eating when hunger allows. Your body needs consistent energy and nutrients to support its healing work, and that remains true whether you’re feeling chilled, flushed, or somewhere in between.

AI Image Disclaimer Images in this article are AI-generated illustrations, meant for concept only.

Sources (Names Only) The Guardian WebMD Scientific American Johns Hopkins Medicine GoodRx