Old wives’ tales about health have been around for generations. Health myths persist because misinformation spreads easily, especially with the popularity of social media. Here is the truth about some of the most common health myths:

• Drink 8 glasses of water daily. According to WebMD, there is no need to count cups. People who drink when they are thirsty stay well-hydrated. In addition, fruit, vegetables, soup, and beverages such as juice, coffee, and tea all contribute to our daily hydration needs.

• Eggs cause heart disease. By now, it’s been pretty well established that eating eggs is good for you, as long as you don’t overdo it. According to Real Simple, all eggs are rich in protein, phosphorus, selenium, chlorine, iron, vitamin A and B vitamins. The B vitamins and choline found in eggs are beneficial to brain health. While eggs do contain cholesterol, experts say that dietary cholesterol does not significantly raise blood cholesterol levels enough to trigger heart disease in healthy people.

• You can catch a cold by being out in cold weather. According to Johns Hopkins Medicine, contrary to popular belief, cold weather or feeling chilled doesn't cause a cold. However, more colds do occur during the cold weather seasons because schools are in session, increasing the risk for exposure to the virus. People also stay indoors more when it’s cold and are in closer proximity to each other, making it easier to pass along germs. The low humidity of winter causes dry nasal passages, which are more susceptible to cold viruses.

• You need a daily multivitamin. You should get most of your daily nutrients from a well-rounded diet that includes lots of fruit, vegetables, nuts, healthy oils and whole grains. But if your doctor feels you are suffering from a deficiency, a vitamin supplement may be needed.

• You need to eat breakfast to lose weight. Not so, say experts from Cornell University who found that people who skipped breakfast didn’t overeat at lunch and dinner and, in fact, ate 400 fewer calories a day.  

• Green mucus means infection. One study looked at green mucus samples from people with a cough and no other lung conditions. It found that only about 1 in 10 of those green mucus samples were caused by a bacterial infection. This means that most people with green mucus don't have a bacterial infection. In short, mucus color alone isn’t a reliable way to say whether you need antibiotics, says GoodRx.

• Sugar makes kids hyper. While sugar isn’t good for children, research shows that it won’t cause them to act out or be unable to focus on their schoolwork.

• Toilet seats can pass along germs. According to WebMD, toilet seats are usually clean. It’s the doorknobs, handles and floors that can be covered with bacteria like E. coli, norovirus and the flu. Use paper towels to cover your hands when opening doors or touching handles and a hand sanitizer afterwards.

• Cracking joints triggers arthritis. While the sound of someone cracking their joints can be annoying, it does not cause arthritis. Experts at the Cleveland Clinic say one reason that your joints may make a cracking noise could be gas escaping from a synovial membrane, or a ligament or tendon passing over another ligament or tendon. However, if you feel regular or severe pain in your joints, seek medical help.