(BlackDoctor.org) — Warm milk will help you sleep, right? Don’t sit so close to that TV screen if you want to save your eyes, right? Not necessarily.
In their new book, Don’t Cross Your Eyes…They’ll Get Stuck That Way, Aaron Carroll, MD, and Rachel Vreeman, MD, both from the Indiana University School of Medicine, use science to dispel health myths that have been passed down through generations.
Here are the surprising tales and truths about popular health habits:
Use Hand Dryers Instead Of Paper Towels
Dryer or paper towel? It’s a confounding daily dilemma. Molecular biologist Keith Redway, of the University of Westminster, has done a series of experiments to put an end to the debate. He found that jet dryers actually increase the amount of bacteria on users’ hands because the air inside the machines is far from sterile. The driers make the restroom dirtier, too, spewing germs more than six feet. Redway named paper towels the winner.
Use Hydrogen Peroxide To Clean Injuries
You know the fizzing that happens when the liquid touches your wound? It’s the sound of the chemical attacking germs, yes, and also your own cells. A study in The Journal of Trauma found that H 2 O 2 inhibits fibroblasts—a type of cell involved in tissue formation—thereby slowing the healing process. The authors recommend washing your cuts gently with soap and water, then dabbing on a topical antibiotic.
If Your Mucus Turns Green, You Need To Take Antibiotics
Congratulations, nose-blowing sleuths! This adage is partially true: When you have an infection, your body sends white blood cells called neutrophils to fight the germs, and when an enzyme in the neutrophils mixes with the healthy cells in your nose, your mucus changes color. The falsehood is that you need antibiotics. The infection in your body is not necessarily bacterial; it could be viral—in which case, no amount of antibiotics will help.
Take Vitamin C To Prevent Colds
It’s true that if you don’t have enough C, you’ll get sick—but with scurvy, not a runny nose. Carroll and Vreeman hypothesize that this bug-fighting theory began when we discovered the vitamin’s link to that infamous sailors’ affliction, in 1932; if C could prevent one illness, the logic likely went, perhaps it could prevent others, too. But dozens of studies have found no difference in the number or duration of colds suffered by people who take C and those who don’t. What is the best way to stay cold-free? “Nothing beats hand washing,” Carroll says.
Drink Warm Milk To Help You Sleep
Even thousands of years ago, the Talmud associated drinking milk with sleep. Today there’s no scientific evidence that it has the slightest impact on drowsiness. Milk does contain the nap-inducing amino acid tryptophan, but only in trace amounts. Eggs and cheese have more, but even an egg and cheese sandwich won’t knock you out. (You’d probably have to eat seven of them, the authors speculate.) However, if a hot-milk nightcap seems to help you catch z’s, drink up. A little placebo effect never hurt anyone.
Sitting Too Close To The TV Will Hurt Your Eyes
When TVs first became popular in the 1950s, they emitted 100,000 times more radiation than they do today, so parents may have been smart to keep their kids away from the tube back then. But sitting too close to a modern set or computer screen won’t do any permanent damage to your eyes. The fuzzy vision and headaches that follow a long day at the office (or an I Love Lucy marathon) are symptoms of eyestrain—a temporary condition no different from the soreness you feel after a workout. Relieve the aching with light massage around your eyes.
Tilt Your Head Back To Stop A Nosebleed
You should tilt your head back to stop a nosebleed. This will keep your clothes, the couch, and the rug clean, but it’s terrible advice, because it directs blood down your throat, which can make you gag or throw up. Instead, doctors say that you should sit up, lean forward, and pinch your nose below the bony bridge to slow (and eventually stop) the bleeding.
Don’t Eat Fried Foods If You Want Clear Skin
Actually, several studies have failed to link a fatty diet to pimples. More sweet news: Unless you’re allergic to it, chocolate won’t lead to breakouts either.