Debunking Medical Mysteries
Staying out in the cold will give you a cold
Colds are caused by viruses, either from inhaling infected air droplets sneezed or coughed by someone infected, or by touching something that an infected person has touched and transferring it to your mouth or nose. You dont get colds from cold air or wind, but the viruses that cause them are more active in the winter- which is why more people get them in the colder months.
Chocolate causes acne
Acne is formed when oil glands in the skin make too much of a waxy substance called sebum that can clog pores along with dead skin cells. This allows bacteria to grow and irritate the blocked pores and lead to the red, swollen appearance. Over washing can cause further inflammation too, so a good balance is key. Studies have disproved the chocolate link, though stress has been shown to cause outbreaks.
Knuckle cracking leads to arthritis
The popping sound when someone cracks their knuckles is caused by bubbles bursting in the fluid that lubricates joints. When the bones are pulled apart, the capsule containing this fluid is stretched and can "pop". A study of 74 people who habitually cracked their knuckles and 226 people who didnt found no difference in rates of arthritis.
Sugar makes children hyperactive
Obesity and cavities are much bigger concerns for children having too much sugar than hyperactivity. At least 12 double blind studies have been conducted that observed how children react with diets containing different levels of sugar. None of them could tell the differences between the children who had and had not consumed the most sugar.