We’ve all heard those medical myths that somehow manage to stick around, no matter how much time passes or how much science debunks them. These myths range from well-meaning but misguided advice to old wives’ tales that persist.
From your childhood memories of being told sugar makes you bounce off the walls to the persistent belief that cracking your knuckles will give you arthritis, these myths are far too common. Let’s set the record straight once and for all and dig into the truth behind each one, offering a deeper look at what’s fact and what’s fiction.
Sugar Makes Kids Hyperactive
The classic myth that sugary treats send kids into a wild frenzy, right? Parents everywhere swear that candy and soda turn their sweethearts into little tornadoes, unable to sit still for even a moment.
This myth is so ingrained in popular culture that it has led many parents to closely monitor their children’s sugar intake, especially during times when they’re expected to behave. However, studies, including large-scale reviews, have shown no link between sugar and hyperactivity in children. A comprehensive analysis of the available research found that sugar doesn’t affect behavior even though it’s often assumed to.
The belief likely stems from situations where children are already excited, such as during birthday parties or holiday celebrations. When kids get their sugar fix, they’re just reacting to the festive environment. It’s not the sugar itself; it’s the excitement of the event that causes them to act out. Think of it this way: if kids are given a sugary treat while watching their favorite movie or opening gifts, they may become energized, but it’s the situation’s stimulus, not the snack, that causes the hyperactivity.
Most Body Heat Is Lost Through the Head
You’ve probably been told at some point to bundle up in cold weather, but above all else, cover your head because most of your body heat escapes from there. This myth has caused many of us to believe that wearing a hat is crucial for staying warm in winter.
The origin of this misconception stems from a 1950s military study in which soldiers, dressed in heavy clothing except for their heads, lost a large amount of heat through their exposed skulls. Since then, the idea that the head is the primary source of heat loss has stuck, despite the fact that it’s inaccurate.
In reality, heat loss is proportional to the amount of exposed surface area, and while the head does lose heat, it represents only about 10% of your total surface area. So, if you’re wearing a full-body winter coat and leaving your head exposed, you’re still losing heat through the rest of your body.
While covering your head can help keep you warm, it’s far from the end-all, be-all of cold-weather clothing. The real key to staying warm is ensuring your entire body is covered, as heat escapes from any uncovered part, whether it’s your head, feet, or hands.
You Must Drink Eight Glasses of Water a Day.
We’ve all heard it: “Drink eight glasses of water a day!” But where does that rule come from, and is it even necessary? It’s based on a 1945 recommendation that adults drink about 2.5 liters (or 8 cups) of water daily.
But here’s the catch: this recommendation was actually referring to total fluid intake, not just water, and it included water in food. So, while eight glasses is a helpful general guideline, it’s not a one-size-fits-all rule.
Your body’s hydration needs vary depending on activity level, age, climate, and health. If you’re active, you’ll need more water. If you live in a hot climate, you’ll need more water.
The best way to know if you’re hydrated is to listen to your body. If you’re thirsty, drink. Simple as that. Also, keep in mind that other fluids count toward your daily water intake too, like coffee, tea, and even juicy foods like watermelon and cucumbers. So, next time you’re told to stick to eight glasses, remember: it’s about total hydration rather than sticking to a strict number.
Chewing Gum Takes Seven Years to Digest
We’ve all heard that if you swallow gum, it’ll take seven years to digest. This myth has been passed down from generation to generation, and for many, it’s a long-standing warning not to swallow gum, especially in school. The myth was perpetuated because gum doesn’t break down in the digestive system like most foods. However, your body doesn’t just let it sit in your stomach for years.
When you swallow gum, it moves through your digestive system just like any other food that can’t be fully digested, such as corn kernels or vegetable fibers. Gum might be made from a non-digestible rubber-like base, but it doesn’t “stick” in your system.
It simply passes through and is excreted in the usual manner. So, while it’s best to avoid swallowing gum for other reasons, like potentially choking, there’s no need to worry about it hanging around in your stomach for eternity.
Cracking Knuckles Causes Arthritis
“You’ll get arthritis if you keep cracking your knuckles!” How many times have we heard this growing up? It’s a common warning, but one that has no scientific backing. People who crack their knuckles are often told that it leads to joint damage and arthritis. However, multiple studies have debunked this myth and found no link between cracking knuckles and arthritis. The noise you hear when you crack your knuckles comes from gas bubbles in the synovial fluid of your joints, not bones breaking.
Some people may experience temporary discomfort or swelling from excessive cracking, but it doesn’t cause long-term harm. The real risks for arthritis are much more related to genetics, age, and joint injuries than a simple knuckle-cracking habit. So, while it might annoy your friends or family, your knuckles are safe from arthritis, at least from this habit!
Teething Causes Fever
Many new parents are under the impression that teething causes fever. The thought is that as the baby’s teeth break through the gums, the discomfort leads to an increase in body temperature. However, this is a common misconception. Teething may cause some discomfort and irritability, but it does not cause a fever.
A baby may get fussy or drool excessively during teething, but a fever is typically a sign of infection, not a developmental milestone. If your baby has a fever during teething, it’s time to consult a pediatrician to rule out any underlying conditions, such as a viral infection. So, while teething can be tough, it shouldn’t come with a fever. If it does, seek medical advice.
Cancer Treatment Is Painful, Pointless, or Always Incurable
One of the most persistent myths surrounding cancer is that the end of treatment is painful, pointless, or always bad. This misconception likely comes from the era when cancer treatments like chemotherapy were harsher and less targeted.
However, cancer treatment has advanced dramatically in recent years. Chemotherapy and radiation therapy have become much more effective and manageable thanks to advances in medicine.
While treatments can still cause side effects, modern therapies, including immunotherapy and targeted therapies, are often less toxic and have higher success rates.
Additionally, many cancers are now treatable or even curable, depending on the stage and type. With the right treatment, many people with cancer can live long, healthy lives. So, don’t let outdated fears prevent you from seeking help. Cancer treatment has evolved, and the prognosis for many patients has improved greatly.
Bed Rest Is Best for Back Pain
For years, doctors recommended bed rest for those suffering from back pain. However, recent studies have shown that staying in bed for extended periods can actually worsen back pain. Prolonged inactivity can lead to muscle stiffness, weakening, and a slower recovery process. Modern research indicates that staying active through gentle exercises and physical therapy helps maintain mobility and strengthens the muscles supporting the spine.
While bed rest may be necessary for severe pain or after surgery, short periods of rest combined with activity are usually the best approach. Most people suffering from back pain can benefit from staying as active as possible, with gentle movements and stretches that don’t strain the back. So, the next time your back hurts, don’t just lie down and wait for it to go away, move, but wisely.
Turkey Makes You Sleepy Because of Tryptophan
Many people think turkey makes you sleepy because of its high levels of tryptophan, an amino acid that promotes sleep. The idea gained popularity around Thanksgiving, when people often ate large meals filled with turkey, potatoes, and other carbs. While it’s true that turkey contains tryptophan, it’s no more than other protein sources, like chicken or cheese.
So, why do you feel tired after a big meal? It’s likely the large portion sizes, the mix of carbohydrates, and the overall heaviness of the meal. After eating a big meal, your body diverts more blood to the digestive system to help process the food, making you feel sluggish and sleepy. So next time you head into a holiday feast, don’t blame the turkey for making you tired; it’s just a lot of food.
Eating at Night Makes You Fat
Many people avoid eating at night because they fear it will cause weight gain. However, weight gain is all about calories consumed versus calories burned, not the timing of your meals. If you eat too many calories during the day or night, your body will store the excess as fat.
What really matters is the total number of calories you consume in a day, regardless of whether you eat them in the morning, afternoon, or evening. Your metabolism doesn’t shut down at night, so eating at night doesn’t automatically lead to weight gain. As long as you’re eating healthy and maintaining a balanced diet, there’s no reason to fear eating after a certain hour.
