Should you really feed a cold?


Chicken soup -- does it heal a cold?
Chicken soup -- does it heal a cold?
John A. Rizzo/Getty Images

Whether you attempt to remedy your cold by curling up with a bowl of hot chicken noodle soup or by eating a chili dog laden with sinus-clearing horseradish and jalapeno peppers, you're following the same time-honored admonition -- feed a cold.

That advice is half of "feed a cold, starve a fever," a folk maxim that dates back to at least the 1700s. It appears to be based on the ancient belief that cold symptoms were caused by a drop in bodily temperature and that stoking your internal furnace with fuel would restore health. Since then, cold sufferers have been consuming comfort foods to stave off symptoms -- often in such quantities that the practice became known as "stuffing" a cold. In fact, in 1901, the Chambers' Encyclopedia advised: "Some…maintain that a good dinner and a tumbler of whiskey or brandy toddy are the best specifics."

Advertisement

But does feeding a cold actually make anyone better? Nineteenth and early 20th century physicians who believed that digestion distracted the body from fighting disease thought hearty eating would only weaken cold patients. But since then, as we've learned more about the viruses that actually cause colds and how the body's immune system fights them, medical science has shifted its position. Today, doctors and dieticians think eating not only can help your body to combat a cold, but also can help you feel better.

But stop before you wash down that glazed donut with a vente Frappuccino. Experts advise cold sufferers to fuel their bodies with a healthy, nutrition-rich diet, including plenty of fruits, vegetables and protein sources, and to consume plenty of water, decaffeinated tea and juices. And as it turns out, your grandma was on to something when she coaxed you to eat chicken soup.

What is it about grandma's soup remedy that works? And what exactly is the common cold?

What is a cold, anyway?

The common cold and its symptoms -- scratchy throat, stuffed-up nose, coughing and sneezing --have bedeviled humans for ages. According to David Arthur John Tyrrell and Michael Fielder's 2002 book "Cold Wars: The Fight Against the Common Cold," the ancient Egyptians had hieroglyphic symbols for colds and coughing, and the ailment was described in detail by the Greek physician Hippocrates about 2,500 years ago.

Over the centuries, people have tried all manner of cures. The Egyptians' painted their noses with lead sulfide ore, dry incense and honey, while the Greeks favored bloodletting, exercise and herbs, and the Romans recommended wine. The medieval Saxons and Normans, who thought colds were caused by evil spirits, uttered magical incantations. In the mid-18th century, Methodist church founder John Wesley advised cold sufferers to drink hot water mixed with oatmeal and honey, soak their feet in hot mustard baths and put orange rinds up their nostrils.

Advertisement

People had no choice but to rely on crazy remedies because it wasn't until after World War II that scientists discovered colds were viral. According to the National Institutes of Health, cold symptoms may be caused by any of more than 200 different viruses [source: NIH]. The most common culprits are rhinoviruses, a word that comes from "rhin," the Greek word for nose, a part of the body that these viruses find particularly inviting for reproduction. You can catch a rhinovirus when an infected person sneezes in your vicinity or touches something that you touch [source: Tolan]. After that, it usually takes two to four days for you to start feeling yucky. Cold symptoms can last from two to 14 days, but most people recover in a week.

What the common cold lacks in seriousness, it makes up for by being -- well -- common. A 2003 University of Michigan study found that three quarters of Americans caught at least one cold per year, and on average, they suffered 2.5 of them [source: Hagen]. And in addition to making our existences temporarily unpleasant and stressful, they cost money. The 2003 University of Michigan study found that Americans spent $2.9 billion a year on over-the-counter medicines, and another $7.7 billion for doctor visits [source: Hagen].

So why's it so important to eat when you're feeling ill?

Why You Should Eat When You Have a Cold

Whoever first advised people to feed a cold probably did it for the wrong reasons. Colds aren't the result of being chilled, and eating raises body temperature only slightly for only about 20 to 30 minutes (which is why experts advise you to wait that long before sticking a thermometer under your tongue). But that anonymous sage got the most important thing right: Eating well is an important part of nursing a cold.

Research shows that your immune system needs to be properly nourished to function properly, and that's especially important when you're run down. In the mid-1990s, for example, the U.S. Army noticed that Ranger trainees were succumbing to infections during training [source: McBride]. Government researchers discovered the problem wasn't the stress of hard exercise, but rather an inadequate diet. When male soldiers didn't consume enough calories to meet their daily needs, their T cells' ability to attack invading microbes decreased by as much as 60 percent [source: McBride].

Advertisement

Studies on animals also indicate that being undernourished makes it tougher to fight off an infection. In a study published in 2008, for example, Michigan State University nutritional immunology researcher Elizabeth Gardner found that mice with a calorie-restricted diet were more likely to die during the first few days of infection than mice with a normal diet, and they took longer to recover from the illness [source: MSU News].

Conversely, a 2002 study by Dutch researchers found that eating actually stimulates the type of immune response that destroys the viruses that cause colds. Six hours after a meal, human subjects' levels of gamma interferon, a substance involved in the process by which T cells destroy cells invaded by pathogen, more than quadrupled. In contrast, a group who drank only water saw their gamma interferon levels drop slightly [source: van den Brink].

But just stuffing your face with fast food or whatever happens to be in your refrigerator isn't necessarily a good idea, either. What are the best menu items for cold sufferers?

What to Eat When You Have a Cold

Your immune system needs calories, but the right nutrients are important, too. Protein helps your body to repair itself and fight infections. Anti-inflammatory chemicals called bioflavenoids -- found in many citrus fruits -- can help reduce the severity of cold symptoms. Foods rich in beta-carotene and vitamins C and E, which are found in many fruits and vegetables, can help reduce the cell damage that cold viruses cause [source: WebMD]. Zinc is another important nutrient, since a deficiency can reduce production and activity of the white blood cells that attack and kill viruses.

Dietician H.K. Jones, in an article for HealthCastle.com, recommends a menu for cold sufferers that emphasizes healthy, nutrient-rich foods -- fruits, vegetables, complex carbohydrates for energy -- and plenty of liquids to keep you hydrated [source: Jones]. A good breakfast, for example, would consist of oatmeal made with water and topped with mixed berries, some whole-grain toast, orange juice and a cup of hot decaffeinated tea. Lunch would include a bowl of soup, a mixed green salad, mandarin orange sections, a glass of tomato juice and more tea. For dinner, have steamed mixed vegetables, whole wheat pasta with tomato sauce, applesauce, sliced fruit and still more tea [source: Jones].

Advertisement

As it turns out, Grandma was right: A scientific study confirms that one of the best things to eat when you have a cold is a nice steaming bowl of chicken soup. University of Nebraska Medical Center researcher Dr. Stephen Rennard analyzed several chicken soup recipes, including his grandmother's, and found that the popular comfort food had anti-inflammatory properties. In particular, chicken soup reduced the movement of neutrophils, the white blood cells whose activity in the upper respiratory tract can cause the congestion and other symptoms that we associate with colds. On the other hand, if what you're really craving is a spicy bowl of chili, indulge yourself. According to nutritionist, dietician and radio host Susan Mitchell, hot and spicy foods help open up the sinuses and reduce congestion [source: Cerino].

Related HowStuffWorks Articles

Sources

  • AIM Digest, "Alcohol and the Common Cold," Nov. 18, 2008. (July 8, 2009)http://www.aim-digest.com/gateway/pages/general/articles/cold2.htm
  • American Lung Association, "Cold and Flu Guidelines: The Common Cold." 2009. (July 8, 2009). http://www.lungusa.org/site/c.dvLUK9O0E/b.35873/k.A28F/Cold_and_Flu_Guidelines_The_Common_Cold.htm
  • "Chambers' Encyclopedia: A Dictionary of Universal Knowledge." Vol III, J. B. Lippincott Company. 1901.
  • Cerino, Vicky. "Got a cold or flu? Try chicken soup to ease symptoms." UNMC Today. Dec. 2, 2008. (July 6, 2009) http://app1.unmc.edu/publicaffairs/todaysite/sitefiles/today_full.cfm?match=5163
  • Fenton, the Rev. Samuel, M.A. "The Excellent Properties of Salted Brandy as a Most Effficacious Medicine and Sedative for Internal as Well as External Injuries, Inflammation, and Local Injuries." Simpkin, Marshall & Co. 1865.
  • Hagen, Carrie. "The common cold coughs up a $40 billion annual price tag." University of Michigan Health System. Feb. 24, 2003. (July 7 2009). http://www.ur.umich.edu/0203/Mar10_03/15.shtml
  • Jones, H.K., R.D. "A Diet to Fight the Common Cold." HealthCastle.com. January 2007. (July 6 2009) http://www.healthcastle.com/cold_diet.shtml
  • Krasner, Robert I. "The Microbial Challenge: Human Microbe Interactions." ASM Press. 2002.
  • Le Page, Michael, "Feed a cold, starve a fever may be right." New Scientist. Jan. 11, 2002. (July 6, 2009) http://www.newscientist.com/article/dn1777
  • McBride, Judy. ""Calorie Slashing and Overexertion Can Stress the Immune System." Agricultural Research Service. January 1995. (July 7, 2009) http://www.ars.usda.gov/is/AR/archive/jan95/stress0195.htm
  • Mayo Clinic, "Cold remedies: What works, what doesn't, what can't hurt." Feb. 23, 2008. (July 8. 2009) http://www.mayoclinic.com/health/cold-remedies/ID00036
  • Medline Plus. "Common Cold." March 6, 2009. (July 8, 2009) http://www.nlm.nih.gov/medlineplus/ency/article/000678.htm
  • Medline Plus. "Temperature Measurement." Nov. 16, 2008. (July 7, 2009) http://www.nlm.nih.gov/MEDLINEPLUS/ency/article/003400.htm
  • Mitchell, Dr. Susan. "Five Foods To Help Fight a Cold." March 18, 2009. (July 7, 2009) http://susanmitchell.org/blog/2009/03/five-foods-to-help-fight-a-cold/
  • "More about starving fevers." The American Practitioner and News, Vol I., page 179. 1886
  • MSU News. "Feed a cold, feed a fever: Research shows calorie cut makes it harder to fight flu." Nov. 24 2008. (July 7, 2009). http://news.msu.edu/story/5748
  • National Institutes of Health, "Dietary Supplement Fact Sheet: Zinc." Nov. 7, 2008. (July 6, 2009) http://ods.od.nih.gov/FactSheets/Zinc.asp
  • Pinnock CB, Graham NM, Mylvaganam A, Douglas RM. "Relationship between milk intake and mucus production in adult volunteers challenged with rhinovirus-2." American Review of Respiratory Diseases. February 1990. Vol. 141, pages 352-356. (July 8, 2009) http://www.ncbi.nlm.nih.gov/pubmed/2154152
  • Rajmik, Michael, M.D. "Rhinoviruses." emedicine. June 30, 2008. (July 6, 2009) http://emedicine.medscape.com/article/227820-overview
  • Terrell, David Arthur John and Fielder, Michael. "Cold Wars: The Fight Against the Common Cold." Oxford University Press. 2002.
  • Tolan, Robert W. Jr., MD, "Rhinovirus Infection." emedicine. May 13, 2009 (July 6, 2009) http://emedicine.medscape.com/article/971592-overview
  • van den Brink Gijs R.; van den Boogaardt, Danielle E. M.; van Deventer, Sander J. H.; Peppelenbosch, Maikel P. "Feed a Cold, Starve a Fever?" Clinical and Vaccine Immunology, Jan. 2002, Vol. 9, No. 1, pages 182-183. (July 1, 2009) http://cvi.asm.org/cgi/reprint/9/1/182
  • WebMD. "Starve a Cold, Feed a Fever?" Dec. 18, 2007. (July 7, 2009) http://www.webmd.com/cold-and-flu/cold-guide/starve-cold-feed-fever