Stress Linked To Harmful Fat And Heart Disease no comments
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A new US study on monkeys identified that social pressure is linked to increase in deposits of harmful fat in the abdomen which can speed up the construct up of plaque in blood vessels, a main danger factor for heart illness which is the number one trigger of death in humans worldwide.
The study was the function of principal investigator Dr Carol A. Shively, a professor of pathology at Wake Forest University School of Medicine in Winston-Salem, North Carolina and colleagues Drs Thomas C Register and Thomas B Clarkson, also at Wake Forest. Their paper appears as the cover story in the present concern of Obesity, the peer-reviewed journal of the Obesity Society.
Shively stated in a media statement that overweight individuals often carry most of their excess fat within the abdomen and fat located here behaves differently to fat inside the rest of the body.
“If there is too significantly, it can have far much more harmful effects on health than fat located in other locations,” she added.
In Western societies, obesity appears to go up as socioeconomic status goes down, and this trend may be the same for heart illness. Shively stated this might be simply because the people who have the least access to resources that buffer us from the stresses of life are the ones most most likely to suffer the well being consequences.
In their paper, Shively and colleagues explained that in previous work with monkeys they showed there had been important links between (1) social pressure along with the amount of fat that gets deposited in the viscera or abdominal cavity, and (2) the amount of fat deposited around the middle of the body and the develop up of plaque in blood vesses (coronary artery atherosclerosis, or CAA).
They said nonetheless that direct relationships among plaque build up and abdominal fat have so far not been demonstrated either in people or animals, and that this was the initial study to appear at links among stress, visceral obesity and CAA in the same time.
For this study, they fed 41 female monkey a Western-style diet containing fat and cholesterol for 32 months. The monkeys had been kept in social groups exactly where a natural dominant-subordinate hierarchy could develop.
In social groups, subordinate monkeys at the bottom of the hierarchy tend to be targets of aggression from other a lot more dominant monkeys greater up the hierarchy. They are also given much fewer opportunities to take part in grooming sessions, and this can boost their social anxiety.
The researchers monitored the monkeys’ social behaviour and ovarian function, along with a number of other biological variables, which includes BMI, pressure biomarkers, as well as the amount of fat inside the abdomen and elsewhere inside the body (ie the subcutaneous fat).
Shively and colleagues discovered compared to monkeys whose ratio of adbominal fat to subcutaneous fat was low, the monkeys whose ratio was high had been also the subordinate ones, who had been socially isolated, received much more aggresssion and less grooming, had impaired ovarian function, and had far more biomarkers of anxiety (desensitized to circulating glucocorticoids). They also had greater heart rates late inside the day and more plaque in their blood vessels (CAA).
Poor ovarian function meant that the ovaries produced fewer protective hormones.
They concluded that poor ovarian function in female monkeys with a high ratio of abdominal fat to subcutaneous fat is really a new discovery and suggests there’s a need to study fat distribution and ovarian function in girls.
They suggested that the pressure of being in the bottom of the pecking order resulted in the monkeys’ release of anxiety hormones that encouraged their bodies to deposit fat in their abdomens or viscera.
We already know that visceral fat encourages the develop up of plaque in blood vessels, and this leads to heart illness, so this study suggests a link from social tension via plaque create up to heart illness.
However, Shively stated that what is intriguing about this relationship is that the bodies of human and monkey females have a natural protection against heart illness: on typical women develop heart illness about 10 years after males.
She stated perhaps tension and create up of visceral fat erodes this natural protection from the ovaries:
“Suppressed ovarian function is actually a extremely serious condition in a woman,” said Shively.
“Women who’re hormone-deficient will create far more atherosclerosis and be at greater risk of creating coronary heart illness and other diseases like osteoporosis and cognitive impairment,” she added.
Women whose ovaries don’t make enough hormones could not be conscious of it as you’ll find often no symptoms: the condition doesn’t always mean fewer menstrual cycles for instance.
Shively stated:
“We should take a closer look at the ovarian function of obese women.
“They may possibly not be producing enough hormones to maintain adequate health,” she warned.
She also said that the study appeared to reinforce the usual message about health: be careful about what you eat, take regular exercise and manage your stress.
“Social Stress, Visceral Obesity, and Coronary Artery Atherosclerosis in Female Primates.”
Carol A. Shively, Thomas C. Register and Thomas B. Clarkson.
Obesity (2009) 17 8, 1513-1520.
doi:10.1038/oby.2009.74
Source: Wake Forest University Baptist Medical Center.
Written by: Catharine Paddock, PhD
Copyright: Medical News Today
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