True or False: Health

Explanation: TRUE! Water makes up about 60% of adult body weight on average (more in children, less in elderly people).

Explanation: FALSE! This number has no solid scientific basis. Water needs vary depending on activity, climate, and diet.

Explanation: TRUE! Laughter releases endorphins, reduces cortisol (stress hormone) and stimulates immune cell production.

Explanation: FALSE! This legend comes from a decimal point error in an 1870 study. Black pudding, lentils, and liver contain far more iron.

Explanation: TRUE! Lack of sleep disrupts hunger hormones (ghrelin/leptin), increases appetite and drives cravings for fatty and sugary foods.

Explanation: FALSE! This is a persistent myth. Brain imaging shows we use virtually all of our brain, even at rest.

Explanation: TRUE! Stress causes muscle tension, especially in the neck and shoulders, which can trigger tension headaches.

Explanation: FALSE! The sound comes from gas bubbles bursting in synovial fluid, it's harmless. A doctor even cracked only one hand for 60 years to prove there's no link to arthritis!

Explanation: TRUE! 30 minutes of brisk walking daily reduces cardiovascular risks, improves mood, and strengthens muscles.

Explanation: FALSE! Reading in dim light temporarily strains the eyes but does not cause permanent damage to vision.

Explanation: TRUE! Cocoa is rich in flavonoids, antioxidants that protect cells. The darker the chocolate (70%+), the more it contains.

Explanation: FALSE! This popular rule has no scientific basis. Digestion does not cause dangerous cramps in water.

Explanation: TRUE! During sleep, the brain transfers information from short-term memory to long-term memory (consolidation).

Explanation: FALSE! Antibiotics only kill bacteria. Against viruses (flu, cold, Covid), they are completely ineffective.

Explanation: TRUE! Physical activity triggers the release of endorphins, which provide a feeling of well-being and reduce pain.

Explanation: FALSE! Many studies have debunked this myth. The excitement observed often comes from the festive context (birthdays, parties), not from sugar itself.

Explanation: TRUE! Meditation lowers cortisol (stress hormone), calms the nervous system, and improves emotion management.

Explanation: FALSE! "Catch-up sleep" does not fully compensate for sleep debt. The negative effects of sleep deprivation persist.

Explanation: TRUE! With an average of 70-80 beats per minute, the heart beats about 100,000 times a day, or 35 million times a year.

Explanation: FALSE! It's the total daily calorie intake that matters, not meal timing. The body does not store more fat in the evening than at any other time.