water glasses
1 / 10

Drink 8 Glasses of Water a Day

No need to count cups. Research shows people who gulp a glass of H2O when they’re thirsty get enough to stay healthy and hydrated. Water-rich foods like soup, fruit, and vegetables and drinks like juice, tea, and coffee all help you get your fill. You might need to drink more water if your urine is dark yellow, you don’t go regularly, you're very active, or you live in a hot climate.

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fried egg
2 / 10

Eggs Are Bad for Your Heart

Omelet lovers, rejoice. Eating an egg or two a day doesn’t raise the risk of heart disease in healthy people. Yes, the yolks have cholesterol, but for most of us, the amount found in any one food isn’t as bad for you as the mix of fats from everything you eat. What’s more, eggs have nutrients, like omega-3s, that may lower the risk of heart disease.

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deodorant
3 / 10

Antiperspirant Causes Breast Cancer

Don’t sweat it! Some scientists think the chemicals found in antiperspirants and deodorants can be absorbed through your underarm. The idea is they end up in breast tissue and make tumors more likely. But the National Cancer Institute says there’s no evidence connecting either product with breast cancer.

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scarf
4 / 10

Being Cold Gives You a Cold

No matter what your grandma might've told you, spending too much time in the cold air doesn’t make you sick. One study found that healthy men who spent several hours in temperatures just above freezing had an increase in healthy, virus-fighting activity in their immune systems. In fact, you’re more likely to get sick indoors, where germs are easily passed.

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taking pill
5 / 10

You Need a Daily Multivitamin

You may have heard that a multivitamin can make up for nutrients that aren't in your diet. Researchers don’t all agree on that point. But if your doctor tells you to take vitamin, do it. And if you’re pregnant, you need to take folic acid to lower the risk of birth defects. Still, the best way to get your nutrients is to eat a diet filled with fruits, vegetables, whole grains, nuts, and healthy oils.

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late man
6 / 10

Eat Breakfast to Lose Weight

Eating breakfast does help some people lose weight. It can stave off hunger, and it might prevent random eating later in the day. If you’re not a breakfast fan, you can still slim down. A Cornell University study found that the non-breakfast crowd didn’t overeat at lunch and dinner, and they ate about 400 fewer calories a day. The bottom line: Skipping breakfast may help some healthy people shed pounds.

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blowing nose
7 / 10

Green Mucus Means Infection

The contents of your tissue can’t take the place of a lab test. Studies show that green or yellow mucus is slightly more common in certain bacterial infections. But it’s not a sure sign that you have one or that you need antibiotics. A sinus infection can cause clear mucus, and a common cold can turn it green.

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lollipop kids
8 / 10

Sugar Makes Kids Hyper

Sugar isn’t good for kids, but research shows the sweet stuff won’t cause them to act out, hurt their schoolwork, or make them unable to focus. Since many parents believe there’s a link, though, they expect their kids to behave badly after eating sugary food. So, they’re primed to notice it if it happens.

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bathroom
9 / 10

A Toilet Seat Can Make You Sick

Don’t stress if you can’t cover the seat. Toilet seats are usually pretty clean -- it’s bathroom doors, door handles, and floors that tend to be covered with bugs like E. coli, norovirus (a.k.a. “stomach flu”), and the flu. Cover your hand with a paper towel before you touch doors or handles, and use hand sanitizer or wash afterward.

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cracking knuckles
10 / 10

Cracking Joints Causes Arthritis

The sound might annoy people around you, but that’s about all the harm it does. You may think bones or joints rub together to cause the noise, but that’s not so. It results from a gas bubble that forms between the bones and “pops.” If you enjoy doing it, keep on. Studies show it doesn’t cause or play a role in arthritis. If you feel regular or severe pain when you do it, see your doctor.

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Sources | Medically Reviewed on 09/01/2016 Reviewed by William Blahd, MD on September 01, 2016

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SOURCES:

Beth Israel Deaconess Medical Center: “True or False: Being Exposed to Wet, Cold Weather Increases the Risk of Infection,” “True or False: Cracking Your Knuckles Can Lead to Arthritis.”

Brenner, IKM. The Journal of Applied Physiology, August 1999.

Charles Gerba, PhD, Professor of Microbiology & Environmental Sciences, The University of Arizona.

Guallar, E. Annals of Internal Medicine, December 2013.

Harvard School of Public Health: “Eggs and Heart Disease,” “Infectious Disease Seasonality," “Vitamins.”

Hoover, DW., Journal of Abnormal Child Psychology, 1994.

Hu FB, JAMA, April 1999.

Neil L. Kao, MD, associate professor of medicine, University of South Carolina School of Medicine

Kennedy, D. Cleaning Industry Research Institute, December 1995.

Levitsky, D. Physiology & Behavior, July 2013.

Mayo Clinic: “Dehydration.”

Miravitlles, M. European Respiratory Journal, June 2012.

The National Cancer Institute at the National Institutes of Health:
“Antiperspirants/Deodorants and Breast Cancer.”

National Research Council, “Dietary Reference Intakes for Water, Potassium, Sodium, Chloride, and Sulfate.”

Swezey, R. The Western Journal of Medicine, 1975.

VanderWal, J. International Journal of Obesity, October 2008.

Wolraich, M. JAMA, 1995.

Reviewed by William Blahd, MD on September 01, 2016

This tool does not provide medical advice. See additional information.

THIS TOOL DOES NOT PROVIDE MEDICAL ADVICE. It is intended for general informational purposes only and does not address individual circumstances. It is not a substitute for professional medical advice, diagnosis or treatment and should not be relied on to make decisions about your health. Never ignore professional medical advice in seeking treatment because of something you have read on the WebMD Site. If you think you may have a medical emergency, immediately call your doctor or dial 911.