Debunking Common Health Myths

Coverage Fox encourages readers to use their health insurance benefits to discuss questions with licensed clinicians rather than viral posts.

Myths About Everyday Habits

Almost everyone has heard health advice about water intake, knuckle cracking, or cold weather exposure. Let’s separate fact from fiction on these common daily-life myths.

Myth: You Must Drink Eight Glasses of Water a Day

The “eight glasses” rule originated from a 1945 misinterpretation of a U.S. Food and Nutrition Board recommendation. That guidance included all fluids and water-rich foods, not just plain water.

Research shows that a fixed volume of water consumption is wrong and not supported by scientific evidence. The common myth that everyone must drink eight glasses of water a day is misleading; healthy individuals typically need about four to six cups of water daily, especially if they also consume water-rich foods like fruits and vegetables.

Hydration needs depend on individual factors, including age, biological sex, activity level, and hot climate, meaning people who are more active or spend time in heat may need more water. A simple check: if your urine is pale yellow, you’re likely well-hydrated. Dark yellow urine may signal that you need more fluids. Waiting until you are thirsty to drink water may indicate that your body is already beginning to be dehydrated, so it’s better to drink water throughout the day.

Myth: Cracking Your Knuckles Causes Arthritis

That popping sound comes from cavitation, the rapid formation and collapse of gas bubbles in synovial joint fluid, not bones grinding together. A study published in the Journal of the American Board of Family Medicine followed 215 subjects over 50 years and found habitual crackers had similar arthritis rates compared to non-crackers.

If cracking actually causes severe pain, that warrants evaluation by a doctor for underlying issues like ligament problems. Otherwise, researchers have found no link between this habit and joint damage.

Myth: Cold Weather Itself Makes You Sick

Spending time in cold air does not directly cause illness, and you do not catch colds or flu from cold air itself; rather, it is viruses and bacteria that lead to colds and flu. A Yale study exposed healthy volunteers to rhinovirus after cold air exposure versus room temperature and found no increased infection rates from cold alone.

Colds and flu are more prevalent in winter months because people tend to stay indoors in close proximity to others, facilitating the spread of viruses. CDC data shows 20–30% higher flu incidence December through February. Research indicates that while cold weather does not increase the likelihood of getting infected, it can exacerbate symptoms if a virus is already present in the body.

Myth: Any Temperature Above 98.6°F is a Fever

The 98.6°F baseline comes from 1868 research by Carl Wunderlich. Modern studies show normal body temperature ranges from roughly 97°F to 99°F, varying by time of day, age, and measurement method. Most U.S. medical professionals define fever around 100.4°F (38°C).

If you’re unsure whether symptoms like fever or dehydration need medical attention, use telehealth or in-network urgent care covered by most health plans.

Nutrition and Diet Myths

Diet advice changes quickly, and outdated nutrition myths still influence grocery choices today. Here’s what current research actually supports.

Myth: Egg Yolks Are Always Bad for Your Heart

Eating an egg or two a day does not raise the risk of heart disease in healthy individuals, and eggs contain nutrients like omega-3s that may lower heart disease risk. An American Journal of Clinical Nutrition meta-analysis reviewing 1.7 million participants found no increased risk from up to one egg daily. Eggs also remain nutritious overall; for example, frying them in butter is less heart-healthy than simpler cooking methods.

Research indicates that most healthy people can consume up to seven eggs per week without increasing their risk of heart disease, although those with diabetes may need to limit their intake. Eggs are low-calorie and nutrient-dense, providing a great source of protein and essential vitamins and minerals, including vitamin D, which is important for bone health.

Myth: All Dietary Fat Is Unhealthy

This myth ignores the difference between harmful and healthy fats. Trans fats and some saturated fats are linked to higher heart disease risk, raising LDL cholesterol significantly. But monounsaturated fats (olive oil, avocados) and polyunsaturated fats (salmon’s omega-3s, nuts, seeds) support brain health and help absorb vitamins A, D, E, and K.

Mediterranean diet trials like PREDIMED (7,447 participants) showed 30% cardiovascular risk reduction with healthy fat intake.

Myth: Carbs Will Automatically Make You Gain Weight

The truth lies in distinguishing refined carbs, including foods high in sugar, from complex carbs. Whole grains like oats, beans, quinoa, and brown rice have lower glycemic indexes and their fiber helps keep blood sugar levels steadier than refined carbs, which matters especially for people with diabetes.

Weight gain comes from excess calories of any type, not carbs alone. Portion control matters more than eliminating entire food groups.

Infections, Immunity, and “Quick Fix” Remedies

People often rely on simple fixes like cranberry juice or “extra vitamin C” instead of seeking proper medical care for infections. Let’s clarify what works and what doesn’t.

Myth: Cranberry Juice Cures Urinary Tract Infections

While cranberry products may slightly reduce the risk of UTI recurrence (26–39% in some women per Cochrane reviews), they do not cure existing urinary tract infections. Symptoms like burning or fever require professional care and usually antibiotics; cranberry juice cannot replace medical treatment.

Myth: Green Mucus Always Means You Need Antibiotics

Mucus color alone cannot distinguish viral from bacterial infections. About 90% of acute rhinosinusitis cases are viral and resolve within 7–10 days without antibiotics. Antibiotics are ineffective against viral illnesses such as colds, flu, and stomach flu (norovirus).

If symptoms include high fever, chest pain, or last more than 10 days, see an in-network primary care provider. Otherwise, the common cold typically resolves on its own. Practicing good hand hygiene helps prevent spreading viruses through the mouth and other contact points.

Myth: Handwashing Isn’t a Big Deal in Everyday Life

Regular handwashing with soap and water (or 60% alcohol hand sanitizer) cuts respiratory infections by 16–21% and diarrheal illness by 30–48%. Pandemic-era studies reinforced that proper hand hygiene remains one of the most effective preventive measures. Paper towel drying is more hygienic than air dryers for removing germs.

Don’t overlook high-touch surfaces like door handles, they can harbor pathogens that spread through hand-to-face contact.

Cancer, Heart Disease, and Other Serious Conditions

Myths about cancer, heart disease, and other serious illnesses can delay lifesaving screening or create false reassurance. Here’s what the evidence actually shows.

Myth: There’s Nothing You Can Do to Prevent Cancer

There is a common myth that you cannot do anything to prevent cancer, but maintaining a healthy lifestyle and getting regular screenings can help reduce the risk of certain types of cancer. WHO estimates 30–50% of cancers are preventable through:

• Not smoking (cuts risk 20–30%)
• Exercise (150 min/week lowers risk 25%)
• Maintaining BMI under 25 (reduces risk 10–20%)
• Following screening guidelines for skin cancer, breast cancer, and colon cancer

Antiperspirants do not cause breast cancer, and the National Cancer Institute says there is no evidence linking their use to the disease. Wearing a bra does not cause breast cancer, and maintaining a healthy weight and avoid alcohol are more effective ways to lower risk.

Myth: Heart Disease Only Affects Older Men

Heart disease is the leading cause of death for U.S. women and men. CDC data shows 1 in 3 women die from it. Women can develop it in their 40s and 50s, especially post-menopause when estrogen drops raise risk 2–3 fold.

Conditions like type 2 diabetes, high blood pressure, and elevated LDL in midlife significantly increase risk. Preventive care, including routine check-ups and screenings, is essential for identifying chronic diseases early.

Myth: Only Men Get Kidney Stones

Women are also affected, about 1 in 12 women experience a kidney stone in their lifetime, and kidney stones are hard mineral deposits that can be very painful to pass. Prevention includes adequate water daily intake (2.5–3L), moderating sodium (< 2,300mg), and balanced calcium intake.

Most health plans cover screenings like mammograms, blood pressure checks, cholesterol panels, and diabetes testing. Coverage Fox helps compare plans so these preventive services remain affordable and easy to access.

Fact-Checking Classic “Old Wives Tales”

Many persistent health myths started as old wives tales long before antibiotics, vaccines, or modern diagnostic tests. Let’s address a few you’ve probably heard.

Myth: Spicy Foods Cause Stomach Ulcers

Most ulcers are due to Helicobacter pylori infection (90%) or long-term NSAID use like ibuprofen (15–20% of users). Research suggests certain spicy foods like chili peppers may even support gut blood flow, though they can irritate existing gastritis.

Treatment for H. pylori involves triple therapy with 85–90% eradication rates, not avoiding food.

Myth: Swallowed Gum Stays in Your Body for Seven Years

Swallowed chewing gum passes through the digestive system within a few days, not seven years. The gum base is mostly indigestible but inert, and complications only arise when large amounts are swallowed frequently.

Myth: The 10,000 Steps Goal Is Scientifically Proven

The popular 10,000 steps per day target actually originated from a 1960s Japanese marketing campaign for a pedometer, not scientific research. Similarly, the myth that people use only 10% of their brains is false—brain imaging shows almost every part is active throughout the day. While walking is beneficial for health, one study found that health improvements plateau around 6,000 to 8,000 steps daily for most adults. This means you don’t need to hit 10,000 steps to gain meaningful cardiovascular and metabolic benefits. Instead, focus on regular movement that fits your lifestyle and gradually increases your overall activity level.

When in doubt, consult a licensed clinician rather than relying on viral posts. Use your plan’s telehealth or nurse advice line if available.

How Accurate Information and Insurance Work Together

Busting health myths is only useful if you can also access real care, checkups, lab tests, and screenings. That’s where having the right health insurance plan matters.