7 Things You’ve Thought Were Healthy Your Whole Life—but Actually Aren't

Maybe your mom repeated them to you or you picked them up from friends at summer camp. Perhaps even a well-intentioned but out-of-the-loop doctor drilled them into your head. However you heard them, health myths definitely aren't doing you any good. Find out why it’s time to give them the heave-ho—and the simple moves you should be making instead.

Loading up on plenty of H20 helps stave off colds, makes you feel full, and keeps your energy running high. But the eight glasses dogma? It’s misleading. “Getting enough water isn't just about drinking glasses of it but includes all the water in foods and drinks,” says Los Angeles-based nutritionist Maggie Moon, R.D., owner of Everyday Healthy Eating. “Also, it’s impossible to say how much water will keep someone healthy. Water needs are not just about metabolism; they change based on environmental conditions and physical activity.” Ditch the one-size-fits-all rule, and use your thirst as a guide for when to hit the water cooler or consume water-rich foods like fruit and salad.

Leaving the house with damp strands on a chilly day might make you shiver—but it won't get you sick, as older generations of moms used to think. “The only way to catch a cold or the flu is to come into contact with the viruses that cause them,” says Holly Phillips, M.D., women’s health physician and author of The Exhaustion Breakthrough. True, research shows that cold and flu viruses thrive in cold weather; that may be because dry winter air dehydrates the mucus membranes of the nose, which helps viruses invade your system. But not finishing your blow dry before heading out the door won’t make you more likely to contract them in the first place.

Actually, going number two anywhere from three times a day to three times a week meets the range of what’s considered regular. “How often you poop comes down to your personal diet habits: how much fluid, fiber, and overall food you take in,” says Phillips. “Most people go once a day, but some people who are perfectly healthy go more often or less.” Be concerned with your poop habits only if you’re suddenly going a lot more or less, your bowel movements are accompanied by pain or blood, or the consistency is much looser or a lot harder than usual.

Like the eight-glasses-of-water rule, this super-specific edict doesn’t work for everyone all the time. The National Sleep Foundation recommends adults score seven to nine hours of sleep each night in order to function at the top of their game mentally and physically the next day, says Phillips. But that leaves plenty of leeway for individual sleep needs. Some people swear they can function fine on five or six hours per night, while others only feel rested with nine or so hours of snooze time.

In a sense, this is true—which is why your system already has a built-in detoxifier, a.k.a your liver.  Products like shakes and juices marketed for “detoxing” might be harmless, or they may actually deprive the body of important nutrition because they replace actual healthy food your system thrives on, says Moon. “The best thing you can do to ‘detox’ is to let the body do what it’s built to do and not get in the way by overeating, drinking, smoking, or consuming too much red meat, refined grains, added sugar, and saturated fat.”

Bread, potatoes, and other grain products have an unearned rep for making people gain weight, while protein and good fats are basking in a health halo these days. But repeat after us: Carbs are not the enemy. “Carbohydrates don’t make you fat—eating too many of them does,” says Moon. “Humans are omnivores, so while there’s more than one way to meet your nutritional needs, it’s worth noting that some of the healthiest eating patterns around, like the Mediterranean diet, prominently feature plenty of carbs in the form of whole grains, fruits, and vegetables.” The trick is to go with the right type—a.k.a the whole-grain or complex kind found in whole plants versus sodas, cookies, and other foods made with refined grains and added sugar.

You know that plastic container of sanitizer you have on your desk—the one you’re always spritzing on your hands? As promising a germ fighter as it sounds, it won’t protect you from infectious bugs any better than good old-fashioned bar soap. A September 2015 study published in the Journal of Antimicrobial Chemotherapy pitted regular and antibacterial soaps against 20 strains of bacteria. The result: Investigators reported no significant difference between the two. It’s not the first study to suggest antibacterial might be b.s., but it’s one of the most thorough to date.