New research into how the brain behaves when exposed to sunlight, and specifically UV rays, reveals that, for some people at least, tanning really might be an addiction.
What’s more, researchers involved in the study, which is published this week in the science journal Cell, believe that their research speaks to a need to be more proactive about understanding why people rely on tanning to make themselves feel good, and how we can use this insight to help them stop.
There’s a big caveat that we need to highlight right from the start, though: this was an animal experiment and so it comes with all the usual concerns, both ethical and practical, the latter of which being that the research may not translate directly in humans. That said, let’s examine what the researchers did, and what they found.
The scientists took a sample of lab mice and then shaved their backs. They exposed the mice to the equivalent of half an hour of midday Florida sun every day for a six week-test period. What they found was that, as expected, UV radiation in this exposure led to the mice producing a particular protein (proopiomelanocortin) that, when broken down, causes pigmentation of the skin — put simply, a tan. However, they also found that the body also produced a glut of endorphins, our so-called “pleasure chemicals.” These chemicals have similar effects on the brain as heroin or morphine.
The researchers extended their study by investigating what would happen if they blocked these pleasurable chemicals by using a drug that is similar to those used in rehab clinics. Mice who were given the drug displayed visible symptoms of withdrawal, including shaking and tremors. Furthermore, and showing intelligent behavior, the mice began avoiding the sites within the test area where the drugs were administered.
As mice brains behave in ways that are similar to how human brains behave, the researchers think that it’s highly probable that humans experience the same “high” from tanning, and in much the same way, as the mice displayed during the test period.
What’s more, this research actually builds on a good body of other studies. For instance, the withdrawal phenomenon that was witnessed in the above mouse sample has actually been seen before. A 2006 study involved giving people who tan a drug called naltrexone, which works to block the endorphins that are produced during tanning. Around 50% of frequent tanners (those who tanned at least once a week) who were given naltrexone before they were exposed to UV rays showed signs of withdrawal, including nausea and tremors. These symptoms weren’t observed in non-frequent tanners.
Even more interestingly, researchers have previously investigated whether regular sun-bed users could tell the difference between UV light and non-UV light sun-beds. They found that a majority of the sample who frequently engaged in tanning had an overwhelming preference (95%) for the UV light beds over the non UV beds. Those test subjects reported feeling more relaxed, and some who reported mild pain beforehand even said that it helped to ease those symptoms too.
This also explains why, even though we know the risks of tanning, which at their most serious is skin cancer, some people feel great anxiety about stopping and report being unable to do so. There’s also cause to think that tanning and the endorphin high creates a cycle that can be incredibly damaging.
There’s reason to suspect that, like with other drugs, people who tan will eventually experience a plateau in their endorphin high because the body will become accustomed to their tanning practices. As a result they, like other addicts, will have to expose themselves to greater levels of UV rays in order to get the same high. Technically, you can’t overdose on UV in the same way you can on heroin, but it goes without saying that increasing our exposure to damaging UV rays only further increases the risks of skin cancer. For people who begin tanning at an early age, this could be particularly dangerous.
“It may be necessary … to more proactively protect individuals, including teens, from the risks of an avoidable, potentially life-threatening exposure and to view recreational tanning and opioid drug abuse as engaging in the same biological pathway,” lead researchers Gillian L. Fell and Kathleen C. Robinson of Harvard Medical School concluded.
Let’s be clear here, though: there’s a big difference between so-called tanning addiction and the use of drugs like heroin. People who seem to rely on tanning have yet to be observed literally giving up all their worldly possessions, sacrificing family relationships and engaging in significant criminal behavior in order to support their health-destroying habit. Therefore, comparing the two addictions more broadly isn’t helpful or accurate. What the researchers are saying isn’t that tanning is as addictive as opiod use, but that it displays functional similarities. As a result, this research suggests that, for some people who have formed this habit, extra support might be needed to help people quit their tanning ways.
For those of you who like to spend safe time out in the sun, there’s good news, though. While this research didn’t specifically look into sunscreen protection, the researchers apparently see no reason why a full-coverage sunscreen, that blocks UVA and UVB rays, could not only protect from burning but also cut down on the endorphin production that can get people hooked on tanning.
Photo credit: Thinkstock.
Disclaimer: The views expressed above are solely those of the author and may
not reflect those of
Care2, Inc., its employees or advertisers.