7 Most Controversial Medical Theories Proven True

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medical theories

Very often different theories and studies cause strife in scientific circles, but sometimes even the most unbelievable of them ultimately prove true. See these 7 most controversial theories that were eventually proven true:

1. Air pollution causes lung cancer

Since 1939, many scientists have argued that cancer is mainly caused by various factors such as air pollution. It took 21 years to confirm this theory.

2. Bacteria cause ulcers

In 1982, doctors Robin Warren and Barry Marshall from Australia associated the bacteria «Helicobacter pylori» with the ulcer, but the medical community argued that the cause of the condition was stress in combination with specific food choices. However, in mid 1990s, the American Institute of Health confirmed their theory.

3. The aspirin reduces the risk of heart attack

In 1950, Lawrence Craven from California published his first research which showed that the effect of aspirin prevents the blood clots that cause heart disease. About 40 years later, the prescription of one aspirin a day to patients with heart disease was adopted.

4. X-rays are harmful

A study of 1911 linked the X-rays to leukemia and other cancers, but the widespread use of the rays that age and mistrust of the medical community did not allow confirmation of this theory. Eventually, in 1956, the American Academy of Sciences issued a report condemning the widespread use of X-rays.

5. Manganese is harmful for the brain

Exposure to high levels of manganese can lead to a condition that is similar to Parkinson’s disease. This condition may lead to mental disorders, tremors, lethargy, and even death.

6. Myopia is a sign of intelligence

According to researchers of Queen Mary Hospital and the University of Hong Kong, the genes associated with myopia survive because they are related to intelligence. So the theory that intelligence and myopia may be connected with each other has a genetic basis.

7. Sunny days make men more violent

According to researchers of Ben-Gurion University in Israel, the crime is two to three times more frequent during the summer in both hemispheres. The main “suspect” appears to be serotonin.


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By |2017-01-13T21:52:56+00:00January 4th, 2014|Categories: Human Brain, Medicine & Genetics, Weird & Unbelievable Facts|Tags: , |4 Comments

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  1. Lear January 5, 2014 at 9:56 pm - Reply

    I remember when many shoe stores had floor based x-ray machines that customers could use to show their foot bones. A big thrill for children. Then they disappeared, probably after x-rays were proven to cause cancer.

  2. Ed January 15, 2014 at 7:47 am - Reply

    “7. … The main “suspect” appears to be serotonin.” Really? On a nice sunny day guys are more likely to go out and party while probably consuming alcohol – a known path to belligerent behavior.

  3. rhobere January 17, 2014 at 6:06 am - Reply

    yea I’m going to agree that the “sunny days make guys violent” thing comes more from the fact that everyone is more active in the summer than, say, when its -20 outside. Its the same reason there is a statistical correlation between rape and ice cream sales. people buy ice cream AND become more social/active in the summer (not to mention more scantly clad).

  4. Natalie January 21, 2014 at 10:11 pm - Reply

    The study about heat and violence was also done in Israel….it’s pretty much always violent there. I don’t know about that one

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