Still carrying a plastic water bottle? According to Dr. Tierno, you might want to consider switching to metal. “Metal can be inhibitory to bacterial growth,” he says. “Plastic may allow microorganisms to adhere, build up, and create a biofilm, which encourages their growth.” Although not all of these germs can cause disease, play it safe and use a bottle brush to scrub the inside of your water bottle every day, especially if you’ve filled it with something other than water.
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Sweaty workout wear is more than gross: It can also carry pathogens like rhinovirus and staph that you may have picked up at the gym. And if that isn’t bad enough, some workout clothes get worn more than once before they’re washed. “That time between washings not only gives the germs time to incubate, but can also create an environment where mold can grow,” says Steven Fiester, PhD, a microbiologist with the University of South Carolina School of Medicine. “Get in the habit of washing your gym clothes after every workout.”
Scientists know that most of the bacteria we run into is beneficial, but when it comes to your eyes, it’s best to stay squeaky clean. “Contacts may come out of the case sterile, but if you pop them into your eyes with a dirty finger you run the risk of everything from conjunctivitis to an infection of the cornea,” says William Schaffner, PhD, an infectious disease and public health specialist at Vanderbilt Medical Center. “Keep your hands clean and you’ll be amazed at how healthy you’ll stay.” Not to mention you’ll avoid these other scary things that can happen when you don’t wash your hands.