The Most Common Myths That Millions of People Still Believe

1. We use only 10% of our brains

No. This is one of the most famous myths about the human brain.

Different areas of the brain perform different functions and constantly interact. The idea that 90% of the brain is essentially unused is not supported by modern science.

2. Everyone must drink exactly eight glasses of water a day

Water is essential, but there is no universal rule requiring every person to drink exactly eight glasses every day.

Fluid needs vary depending on physical activity, temperature, health, diet and other factors. Mayo Clinic notes that people's individual fluid requirements can differ considerably.

The important thing is adequate hydration, not a magic number.

3. Shaving makes hair grow back thicker

This is a myth.

Shaving cuts the hair shaft above the skin and does not change the hair follicle. Newly regrown hair can look darker or feel rougher because of the blunt cut, but shaving does not make the hair itself thicker.

4. Reading in dim light permanently damages your eyesight

Poor lighting can make your eyes feel tired or uncomfortable.

But the claim that reading in dim light will automatically cause permanent damage is too simplistic.

Comfortable lighting is still a good idea, especially when reading for long periods.

5. Hair and nails continue growing after death

They do not.

Normal growth processes stop after death.

However, the skin gradually changes and dries out, which can make hair and nails appear longer. This visual effect probably helped create the myth.

6. Sugar automatically makes children hyperactive

The relationship between sweets and children's behaviour is much more complicated.

Behaviour can be influenced by many factors, including the environment, mood, excitement and expectations.

Children also tend to eat lots of sweets at parties and celebrations — situations that are already highly stimulating.

7. Any food eaten after 6 p.m. turns into fat

The body does not suddenly change how it processes food when the clock reaches a particular hour.

Body weight is influenced by overall energy intake, diet, physical activity and many other factors.

The issue is usually not a magical “forbidden hour”, but the overall pattern of eating.

8. Everyone must eat breakfast immediately after waking up

Breakfast can certainly be part of a healthy diet.

But there is no universal rule saying that every person must eat within the first hour after waking.

Appetite, daily schedules and nutritional needs vary.

9. Cold weather itself causes a cold

The common cold is caused by viruses.

Cold temperatures themselves do not cause an infection. However, cold weather can influence people's behaviour and the amount of time they spend indoors, which may affect how viruses spread.

So the relationship is more complicated than simply “you got cold, therefore you got sick.”

10. The more vitamins you take, the healthier you will be

Vitamins are essential, but taking larger amounts does not automatically make you healthier.

Some vitamins can accumulate in the body, and excessive amounts of certain supplements can be harmful.

“More is better” is therefore a poor rule when it comes to vitamins.

Why do myths survive?

Because simple explanations are easier to remember and repeat.

Reality is often more complicated.

So the next time you hear a surprising “fact”, ask yourself:

“Is this actually supported by evidence — or have I simply heard it many times?”

Sometimes that one question is enough to separate knowledge from myth.