It starts as a scratch at the back of your throat. By the next morning your nose is running, and by day two your head feels packed with wet wool...

Most adults catch two or three colds a year. And no pill on the shelf can cure one. So you stand in the cold aisle, read the boxes, and hope one of them takes the edge off.

But one of the oldest cold remedies on earth may already be in your kitchen. It's a pot of water, a whole chicken, and the roots at the bottom of your vegetable bin. A lung doctor in Omaha once checked that pot in a lab. Here's the recipe he tested, cut down to a home size.

What you need: One whole chicken, four to five pounds. A few extra wings, if you have them. Three onions. One sweet potato. Three parsnips. Two turnips. About eight carrots. Four celery stalks. One bunch of parsley. Salt and pepper.

How: Set the chicken in a big pot and cover it with cold water. Bring it to a boil. Add the wings and the onions, sweet potato, parsnips, turnips, and carrots, cut in big chunks. Let it bubble about an hour and a half, and skim off the fat as it rises. Then add the celery and parsley and cook 45 minutes more. Lift out the chicken and save the meat for another meal. Mash or blend the soft roots and stir them back in. Salt and pepper to taste. It freezes well.

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Stephen Rennard studied lungs at the University of Nebraska Medical Center. When a cold went around his house, his wife Barbara made the soup her grandmother made. The family just called it Grandma's soup.

It was not a thin, clear broth. Grandma packed the pot with roots. And during the Great Depression she added a twist. She mashed the cooked roots and stirred them back in, so nobody at the table left the vegetables behind.

People have trusted a bowl like this for a long time. In the 1100s, the doctor Maimonides told people with chest and nose troubles to eat chicken soup. But in 1993, Rennard did something new. He carried a batch of Grandma's soup into his lab. The full study ran in the medical journal Chest in October 2000.

Here's the thing. Much of the misery of a cold doesn't come from the virus itself. It comes from your body's answer to it...

When a cold virus gets into the lining of your nose and throat, your body sounds an alarm. White blood cells called neutrophils rush to the spot. These first responders fight the bug. They also stir up swelling and tell the lining to pour out mucus. That's your stuffy head, your cough, and your box of tissues.

So Rennard asked a plain question. Could the soup slow that rush down?

His team took first responders from the blood of healthy people. They set the cells in a small lab chamber with a chemical alarm on the far side. Then they added watered-down soup and counted how many cells made the trip.

The Omaha test: Soup slowed the cells' rush toward the alarm, and more soup slowed them more. Early broth, with only the chicken in the pot, did nothing. Every sample taken after the first roots went in did.

Take a look at how they found that. The team pulled 19 samples as the soup cooked, from the top, the bottom, and the middle of the pot. Plain chicken broth, with nothing else in it, showed no effect. Then the onions, sweet potato, parsnips, turnips, and carrots went in. From that point on, every sample slowed the cells.

They tested each part on its own, too. Every vegetable, and the chicken, boiled alone for an hour, had some effect. But the vegetable broths by themselves harmed a few of the cells in the dish. The finished soup didn't.

You see, a whole soup is more than a list of parts. The team never found one star compound. They guessed that many small ones may work as a team.

And the store shelf? They tried 13 soups from a local grocery. Many slowed the cells, and five did it better than Grandma's. Two did nothing at all.

The second test is older. In 1978, a team at Mount Sinai Medical Center in Miami Beach gave 15 healthy adults hot water, cold water, or hot chicken soup. Then they timed how fast mucus slid along the inside of the nose. That slide is how your nose cleans itself out.

Sipped hot, the soup sped it up by about a third. Hot water, sipped the same way, did about as well. Cold water did the reverse and slowed the slide by more than a third.

Drinking through a straw cut the boost. That points to the steam you breathe in as you sip. But soup through a straw still worked when hot water through a straw didn't. So the smell or taste of the soup seems to add a bit more.

Of course, the boost was gone by the half-hour mark. A bowl helps while you're in it.

I'll say it plain. The Omaha test was done in a dish, not in a person with a cold. Rennard said so himself. Nobody knows if enough of the soup reaches your nose and throat after you eat a bowl. And the Miami group tested 15 people who weren't sick.

In 2025, a team in Scotland and Australia pulled together every trial of soup for colds and flu they could find. There were just four, with 342 people in all. In some, a stuffy nose, a sore throat, and the tired feeling were milder. None of the four checked whether people missed fewer days of work.

So soup won't cure a cold, and it won't stop you from catching one. But a hot bowl of real roots and chicken is cheap, safe for most people, and backed by more science than you'd guess.

Don't save the vegetables for the last ten minutes. In the Omaha pot, the effect showed up soon after the vegetables joined the chicken, with hours of cooking still to go.

Skip the straw and skip the cold leftovers. Lean over the bowl, breathe the steam, and take slow sips while it's still hot. In Miami, cold water slowed the nose down.

Store soups swung a lot in the Omaha test, and two did nothing. Many cans also carry a lot of salt. If you buy one, pick a low-sodium label and add your own roots to the pot.

Grandma mashed those roots back in so nothing went to waste. She had no lab and no chamber. But she knew the pot needed more than the bird.

Decades later, a lab in Omaha found a hint of why. The broth did little on its own. It started working in the dish once the roots joined it.

So make the pot this weekend. Put one bowl in the freezer with your name on it.