More medical myths: Turkey doesn't make you tired?

January 7, 2009 By Jennifer Muir

What if someone told you turkey doesn't make you tired, or that you nails really don't keep growing after you die?

The answer: The British medical journal BMJ. Last month, the journal published a list of health myths related to the holidays.

It was the journal's second study into health-related myths that even many doctors believe. You can find the seven myths from the first study lower down in this story. But first, some perspective from Dr. Laura Mosqueda, the medical director of the UC Irvine Senior Health Center, who said after reading the myths that the most important message is not related to the medical beliefs at all.

"It is that we are susceptible to believing unproven concepts if they are repeated often enough by 'experts' (real or self-perceived/self-proclaimed)," Mosqueda said.

So here are the other seven myths.

1. Drink eight glasses of water each day

The authors found references as early as 1945 suggesting that healthy people should stay hydrated by drinking eight glasses of water each day. But they say there's a complete lack of evidence supporting that recommendation. Studies also show that most people get enough fluids through daily consumption of juice, milk and even caffeinated drinks.

2. People only use 10 percent of their brains

This myth has been around for more than a century. Some believe it came from Albert Einstein, although the authors found no evidence of that. What they did find were studies that show people use much more than 10 percent of their brains. For example, when almost any area of the brain is damaged, it has "specific and lasting effects on mental, vegetative and behavioral capabilities." Also, imaging studies have found no area of the brain is completely inactive.

3. Hair and fingernails keep growing after death

While it's impossible for the body to continue the complex hormone regulation needed to cause hair and nails to grow after death, this myth does have a basis in a biological phenomenon that sometimes occurs after death.

When someone dies, dehydration of the body can cause the skin around the hair or nails to retract, creating the appearance of increased length. But the authors say this is an optical illusion.

4. Shaving causes your hair to grow back faster, darker or thicker

Several studies show that shaving has no effect on the thickness or rate of new hair growth. But because shaved hair is blunt, and doesn't have the finer taper at the ends of unshaven hair, it can give an impression of being coarse. And new hair sometimes appears darker because it has not yet been lightened by the sun or other chemical exposures.

5. Reading in dim light ruins your eyesight

While reading in dim light can cause eye strain, and the uncomfortable effects that go along with it such as dryness and difficulty focusing, it does not cause permanent damage, the authors say.

6. Eating turkey makes you especially tired

If turkey contains tryptophan, and science has found that tryptophan can cause drowsiness, how is this medical belief a myth?

The authors say turkey doesn't contain "an exceptional amount of tryptophan." In fact, turkey, chicken and minced beef contain nearly the same amounts of the amino acid. Other proteins, such as pork or cheese, contain more tryptophan per gram than turkey.

Perhaps the reason turkey has long been accused of making people extra sleepy is because of all the overeating we do on Thanksgiving. Studies show that eating any large, solid meal can make you tired because blood flow and oxygenation to the brain decreases. Plus, meals that are high in protein or carbohydrates can cause sleepiness. So can wine.

7. Cell phones cause significant electromagnetic interference in hospitals

Hospitals widely banned cell phone use after a front page Wall Street Journal story cited an article detailing more than 100 reports of suspected electromagnetic interference with medical devices before 1993. But an Internet search by the study's authors could not find any cases of death caused by use of a mobile phone in a hospital. They did find reports of less serious events, such as false alarms or incorrect medical readings.

Meanwhile, subsequent studies show little or no interference. For example, a 2007 study examining mobile phones "used in a normal way" found no interference in 300 tests in 75 treatment rooms.

___

© 2009, The Orange County Register (Santa Ana, Calif.).
Visit the Register on the World Wide Web at http://www.ocregister.com/
Distributed by McClatchy-Tribune Information Services.

4.8 /5 (4 votes)  

Rank 4.8 /5 (4 votes)
Related Stories
Relevant PhysicsForums posts

More news stories

Overeating may double risk of memory loss

New research suggests that consuming between 2,100 and 6,000 calories per day may double the risk of memory loss, or mild cognitive impairment (MCI), among people age 70 and older. The study was released today and will be ...

Medicine & Health / Neuroscience

created 4 hours ago | popularity 5 / 5 (2) | comments 0 | with audio podcast

Starve a virus, feed a cure? Findings show how some cells protect themselves against HIV

A protein that protects some of our immune cells from the most common and virulent form of HIV works by starving the virus of the molecular building blocks that it needs to replicate, according to research published online ...

Medicine & Health / Research

created 7 hours ago | popularity 5 / 5 (1) | comments 0 | with audio podcast

Declining health-care productivity in England: Who says so?

Reports that the National Health Service in England has been declining in productivity in the last decade appear to have been accepted as fact. However, a Viewpoint published Online First by The Lancet disputes this. The Vi ...

Medicine & Health / Health

created 2 hours ago | popularity not rated yet | comments 0

Injured boomers beware: Know when to see doctor

(AP) -- It happened to nurse Jane Byron years after an in-line skating fall, business owner Haralee Weintraub while doing "men's" push-ups, and avid cyclist Gene Wilberg while lifting a heavy box.

Medicine & Health / Health

created 9 hours ago | popularity 5 / 5 (1) | comments 0

FDA-approved drug rapidly clears amyloid from the brain, reverses Alzheimer's symptoms in mice

Neuroscientists at Case Western Reserve University School of Medicine have made a dramatic breakthrough in their efforts to find a cure for Alzheimer's disease. The researchers' findings, published in the journal Science, show t ...

Medicine & Health / Neuroscience

created Feb 09, 2012 | popularity 4.9 / 5 (58) | comments 17 | with audio podcast


Scientists discover molecular secrets of 2,000-year-old Chinese herbal remedy

For roughly two thousand years, Chinese herbalists have treated Malaria using a root extract, commonly known as Chang Shan, from a type of hydrangea that grows in Tibet and Nepal. More recent studies suggest that halofuginone, ...

New method to examine batteries -- MRI from the inside

There is an ever-increasing need for advanced batteries for portable electronics, such as phones, cameras, and music players, but also to power electric vehicles and to facilitate the distribution and storage of energy derived ...

A mitosis mystery solved: How chromosomes align perfectly in a dividing cell

Although the process of mitotic cell division has been studied intensely for more than 50 years, Whitehead Institute researchers have only now solved the mystery of how cells correctly align their chromosomes during symmetric ...

Google might launch Drive for cloud storage soon

(PhysOrg.com) -- Google's next big move, according to the Wall Street Journal, is a cloud storage service called Drive. Hardly first to the plate, Google is simply catching up to introducing its cloud reposi ...

Lab study raises questions over nano-particle impact

Tests involving chickens have raised questions about the impact on health from engineered nano-particles, the ultra-fine grains commonly used in drugs and processed foods, scientists said on Sunday.

Researchers find extensive RNA editing in human transcriptome

In a new study published online in Nature Biotechnology, researchers from BGI, the world's largest genomics organization, reported the evidence of extensive RNA editing in a human cell line by analysis of RNA-seq data, demons ...