12 Medical “Facts” That You Actually Need To Stop Believing

Myths are great when you are fully aware that they’re myths. They’re not so great when you go spouting them around to your mates, only to be knocked back ‘cos they’re in the know! These are some Medical Myths that are exactly that – myths.

1. Too much sugar makes children hyperactive.

drummer hyper
Universal Pictures / YouTube / Via youtube.com

According to a big review of all the scientific literature on the topic, it’s a total myth. In experiments, kids were given either sugary drinks or ones with artificial sweetener, and there was no noticeable change in their behaviour.

3. Creative people use the right side of their brain more.

By Henry Gray – commons.wikimedia.org, Public Domain / Via simple.wikipedia.org

Lots of people believe it, but the research doesn’t back it up. The two halves of the brain are not identical – a lot of your language processing probably goes on in your left hemisphere, for instance – but everyone uses both halves of their brain. There’s no evidence that “creative” people use the right hemisphere more, or that “logical” people use the left.

4. Stretching before exercise makes you ache less after it.

CBC running flashback track and field warmup
CBC / Via giphy.com

Nope, probably not. A Cochrane Review, a comprehensive roundup of the scientific evidence, looked at 12 studies, and found that warm-ups had only the tiniest effect on delayed onset muscle soreness after exercise.

Several other literature reviews found either no evidence or inconclusive evidence for whether warm-ups reduce the chance of injury, as well, although that may be because not enough good research has been done.

5. You should drink eight glasses of water a day.

water mma gina carano wmma muay thai
Fox Searchlight / DailyMotion / Via dailymotion.com

A review of the literature said “no scientific studies were found” which supported it.

The study traced this myth back to a 1940s recommendation by the US Food and Nutrition Board that “a suitable allowance of water for adults is 2.5 liters [roughly eight half-pint glasses] daily”. But two sentences later it says “Most of this quantity is contained in prepared foods.”

It may have been popularised by a pseudoscientific book by Fereydoon Batmanghelidj, Your Body’s Many Cries for Water, which made the “eight glasses” claim and said that asthma, diabetes, Alzheimer’s and other diseases were caused by not drinking enough water.

6. Reading in bad light makes you shortsighted.

Reading in bad light makes you shortsighted.


There’s no evidence for this, and eye doctors say that it doesn’t happen. The BMJ included it in a list of “medical myths”.

7. Sitting too close to the telly makes you shortsighted.

tv television dog excited tennis
BBC / YouTube / Via youtube.com

No evidence for this either, according to the Royal National Institute for the Blind.

8. We only use 10% of our brains.

We only use 10% of our brains.

By Dr. Johannes Sobotta – Atlas and Text-book of Human Anatomy Volume III Vascular System, Lymphatic system, Nervous system and Sense Organs, Public Domain / Via commons.wikimedia.org

All the bits of your brain have a function, which is why you can’t damage any bit of it without noticing the effects. We all use pretty much all of our brains over the course of the day, although not all of it is in use at any given moment.

9. Shaving makes your hair grow back faster or thicker.

The Simpsons season 18 episode 4 18x04 milhouse van housten
Giphy / Via giphy.com

This was debunked way back in 1928 and has been confirmed several times since.

10. Your hair and fingernails continue to grow after your death.

Your hair and fingernails continue to grow after your death.

ThinkStock / BuzzFeed

According to forensic biologists, this doesn’t happen, although “shrinkage of the skin can make it seem as though they do”.

11. You lose most of your body heat through your head.

You lose most of your body heat through your head.


Apparently you only lose about 10%, which is roughly how much you’d expect, given the surface area of your head.

12. Mobile phones cause cancer.

vrt bored phone yawn boring
Paramount / YouTube / Via youtube.com

Two major studies looking at hundreds of thousands of people both found no link.

Don’t get your head tied in a bunch of myths! Get yourself on one of our Science courses here at The Sheffield College and soon you’ll be astounding mates with facts and myth busting yourself!


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