Some medical myths endure no matter how many times they’ve been disproved.

When making the choices needed to optimize health, it is critical to have accurate information. Otherwise, our diet and lifestyle sacrifices, for which we sometimes give up things we enjoy, may harm instead of help.

Because of this, I would like to look at common, and simply wrong, medical myths about things we avoid for our health, and then let’s look at what the science really shows. Along the way, you may find you get to enjoy your pleasures again — guilt-free!

Medical Myth 1: Skinny People Live Longer

Being overweight won’t kill you — it may even help you live longer. That’s the latest from a study that analyzed data on 11,326 Canadian adults ages 25 and older who were followed over a 12-year period. The report, published online last week in the journal Obesity, found that, overall, people who were overweight but not obese were actually less likely to die than people of normal weight.

By contrast, people who were underweight were more likely to die than those of average weight. Their risk of dying was 73 percent higher than that of normal weight people, while the risk of dying for those who were overweight was 17 percent lower than for people of normal weight. The finding adds to a simmering scientific controversy over the optimal weight for adults.

Medical Myth 2: Salt Is Bad For You

In 1996, the Journal of the American Medical Association published a meta-analysis of 56 clinical trials done since 1980 in people with normal blood pressure, and found that extreme salt reduction had little effect on lowering blood pressure.

In another recent study, the investigators found that the less salt people ate, the more likely they were to die of heart disease. And another article shows that eating less salt increases triglycerides and other hormones in the blood, which increases blood pressure and heart attack risk.

And in a review of another meta-analysis in 2011, an article in Scientific American stated:

“This week a meta-analysis of seven studies involving a total of 6,250 subjects in the American Journal of Hypertension found no strong evidence that cutting salt intake reduces the risk for heart attacks, strokes or death in people with normal or high blood pressure.”

Medical Myth 3: Oily Food Is Bad For You

This depends on the kind of fat. Trans fats (added to many processed foods — especially margarine, which was touted as more “heart healthy” than butter) is a major killer. Butter is much healthier.

Fish oil is especially healthy. Fish oil deficiency is the sixth leading cause of death in the United States.

Omega-3 deficiency is the sixth biggest killer of Americans and more deadly than excess trans fat intake, according to a 2010 Harvard University study. Researchers looked at 12 dietary, lifestyle and metabolic risk factors such as tobacco smoking and high blood pressure and used a mathematical model to determine how many fatalities could have been prevented if better practices had been observed. The study, jointly funded by the Centers for Disease Control and Prevention through the Association of Schools of Public Health, drew on 2005 data from the U.S. National Health Center for Health Statistics. They determined that there were 72,000 to 96,000 preventable deaths each year due to omega-3 deficiency, compared to 63,000 to 97,000 for high trans fat intake.

Restore Full Balance To Your Body And Life With Equilibrium

Medical Myth 4: Eggs Raise Cholesterol

Several studies (six studies at my last count) showed that eating six eggs a day for six weeks had no significant effect on cholesterol levels. Meanwhile, eggs are the best (most complete) protein source available — short of being a cannibal and eating other people!

Medical Myth 5: Chocolate Is Bad

Dark chocolate has been shown to be high in antioxidants and offers numerous health benefits. Simply enjoy it in moderation.

Medical Myth 6 (The Most Deadly Myth): Avoid Sunshine

This especially dangerous piece of medical mal-advice is causing an epidemic of vitamin D deficiency, and is estimated to be causing 85,000 excess cancer deaths a year in the United States. Vitamin D deficiency also contributes to obesity and numerous other medical problems. The proper advice? Avoid sunburn, not sunshine!

The Overriding Fallacy

The great fallacy is that things that make you feel good are bad for you. I suspect it is quite the opposite, and that these are the things that are good for you! Listen to your body, and see how you feel overall with different pleasures. If they leave you feeling better overall long term, I suspect that odds are they are beneficial. I trust what our body and feelings tell us much more than the busted myths put out by our usually well-meaning, but our often wrong, medical system.