Fri, Feb 24, 2017 | updated 11:36 AM IST

Rank in social order is linked with being healthy or not

Updated: Oct 21, 2016 11:08 IST

Washington D.C. [USA], Oct. 21 (ANI): A new study says that uncertainty about one's social rank may lead to health deterioration.

In the study by University of California - Davis, center researchers showed that having an uncertain position in the rhesus social hierarchy may be harmful to the health of those at the top of the hierarchy but not necessarily for those at the bottom.

Monkeys don't have friend-lists or Instagram followers. Their social rank is not governed by computer algorithms, but by many complex factors according to lead authors of the study researchers Jessica Vandeleest and Brianne Beisner.

Still, the monkey model established by the UC Davis researchers could one day help doctors learn more about the way that social hierarchy affects the health of humans.

"Low social status is generally thought to lead to poorer health, yet so many exceptions undermine this apparent association that it is difficult to draw a direct relationship between status and health," Vandeleest said. "In most studies, social status is typically represented by a simple rank order, a hierarchy where someone is 'top dog' and others rank in successively lower positions, with higher ranks getting the best and most of everything. Yet social status is more complex than just simple rank. Another, perhaps more important aspect of status is certainty of social status."

The team found that social rank and rank uncertainty predicted key risk factors for poor health, specifically pro-inflammatory proteins (C-reactive protein, interleukin-6, and tumor necrosis factor-alpha) which are risk factors for chronic diseases such as cardiovascular disease and diabetes.

Vandeleest, Beisner and collaborators measured the level of certainty or uncertainty of the monkeys' social status in captive rhesus monkey groups at the CNPRC. They did this by observing how the monkeys interacted with each other, in cases where the monkeys were not interacting directly with other monkeys; their relationships were inferred through mutual social connections.

The team used these indirect connections to decipher the social rank of the animals and how well they fit in the hierarchy.

McCowan's work focuses on using computational systems science to examine the complex relationships between social life and health.

The researchers discovered that high ranking monkeys with low certainty of their social status showed higher markers of inflammation, which can be a sign of a chronic disease state such as diabetes, than those with very certain status.

So high-ranking monkeys may experience some health risks, but only when their position is questionable and they are consequently at risk of losing their status.

The opposite pattern was found for low ranking monkeys, high dominance certainty was associated with higher markers of inflammation, whereas low certainty was associated with lower levels of inflammatory proteins. Monkeys that are uncertain in their low rank might have opportunities for upward mobility in the hierarchy, which may be associated with better health outcomes.

Vandeleest said the results of the study show that status uncertainty alone may be a risk factor for acute diseases. The results also indicate that uncertainties in status over longer period in relationship to rank are related to chronic disease states as well.

The study was published in PeerJ. (ANI)

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