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A potentially deadly fungus that has been sickening HIV/AIDS patients in Southern California for decades grows on trees, a new study finds.

temperature, and when their endorphin rush was blocked, they showed classic symptoms of withdrawal including shaking, trembling and teeth chattering.

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Dr. David Fisher, the lead researcher on the new study, agreed. "This suggests that (tanning) is not purely a cosmetic decision," said Fisher, who heads the dermatology service at Massachusetts General Hospital in Boston.

Young adults who struggled with depression in adolescence appear to have "hyper connected" networks in their brain, researchers are reporting.

Athletes who seem to have recovered from a concussion may actually show a subtle worsening in a particular mental ability after they return to exercise, a small study suggests.

"This supports the idea that UV exposure is rewarding to the brain, and could have the potential for addiction," said Dr. Bryon Adinoff, a psychiatrist at University of Texas Southwestern Medical Center and the VA North Texas Health Care System in Dallas.

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According to Adinoff, the new mouse findings suggest a pathway for how that could happen: UV radiation hits the skin, where beta endorphins are released, and those chemicals then tap into the brain's reward regions.

California trees harbor fungus deadly to people with HIVCalifornia trees harbor fungus deadly to people with HIV

Experts said the findings, reported in the June 19 issue of the journal Cell, add to evidence that "tanning addiction" is real.

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"The skin is more affected by cancer than any other organ in the human body," Fisher said. Particularly concerning, he added, is the rising incidence of melanoma the least common, but most serious form of skin cancer.

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Someone who has been mugged in a dark alley will likely never want to return there, having associated that location with a fear of being attacked.

A potentially deadly fungus that has been sickening HIV/AIDS patients in Southern California for decades grows on trees, a new study finds.

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Since UV light triggers the skin to synthesize vitamin D, Fisher speculated that humans might have evolved to find UV radiation rewarding. That might be fine, Puma Running Shoes Women

Adinoff and Fisher both said they were not aware of any "tanning addiction" treatment being done in the real world. But both said that's a possibility that Puma Shoes All Models

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And in the mice, those UV generated endorphins showed effects: The animals became less sensitive to touch and Puma Light Purple

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By Amy NortonHealthDay Reporter(HealthDay News) Despite the well publicized risks of Puma Shoes For Men Images skin damage and cancer from too much sun, people continue to soak up ultraviolet radiation outdoors and in tanning salons. Now a new animal study adds to evidence that for some, tanning is truly an addiction.

The mouse study did not actually delve into brain effects. But, combined with human research, Adinoff said, "this makes a strong case for a skin brain connection. What this gives you is a biological mechanism that may explain why people feel this way" about UV exposure.

Someone who has been mugged in a dark alley will likely never want to return there, having associated that location with a fear of being attacked.

In experiments with mice, scientists found that exposing the animals to a daily dose of UV light boosted their blood levels of beta endorphins within a week. Beta endorphins are "feel good" hormones that act on the same brain pathways as so called opioid drugs like heroin and morphine.

Young adults who had depression have 'hyper connected' brain networksYoung adults who had depression have 'hyper connected' brain networks

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Athletes who seem to have recovered from a concussion may actually show a subtle worsening in a particular mental ability after they return to exercise, a small study suggests.

Mouse study supports notion of 'tanning addiction'

should be studied for tanners who seemingly cannot stop those, for instance, who do it despite a history of skin cancer.

Young adults who struggled with depression in adolescence appear to have "hyper connected" networks in their brain, researchers are reporting.

Adinoff said the knowledge that tanning could be addictive might make people think twice before hitting the tanning salon or basking under the sun. But it's probably too soon for hardcore sun worshippers to seek addiction treatment.

Scientists 'rewrite' bad memories in miceScientists 'rewrite' bad memories in mice

Adinoff, who was not involved in the research, led a 2011 study that looked at brain activity in people who habitually used tanning beds. It found that UV exposure activated "reward" centers in the brain in a manner similar to drugs, alcohol or food.

if not for the fact that too much sun or indoor tanning can lead to skin cancer.

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