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New study attempts to link bone loss with isolation

14 Jul New study attempts to link bone loss with isolation

New research on a large cohort of women aged 50 and over has found a surprising link between
poor quality social relationships and the presence of bone loss. This finding further emphasizes
the importance of relationships — not just to mental and emotional well-being but also to
physical health.
More than 53 million people in the United States have an increased risk of osteoporosis-related
bone fracture, according to the National Institutes of Health (NIH).
Osteoporosis is most likely to affect older people, particularly women who have already been
through menopause. Studies show that women are as much as four times more likely than men to
experience bone loss.
This is why specialists have taken a particular interest in identifying all modifiable risk factors
for bone loss in women.
New research from the University of Arizona in Tucson — in collaboration with other
institutions — has now identified what might seem like a surprising connection between a
person's social bonds and the amount of bone loss they experience.
The new study — whose findings feature in the Journal of Epidemiology & Community Health,
a BMJ publication — suggests that what might make a difference to a person's bone health is the
quality, though not the quantity, of their social relationships.
This factor is part of a measurement of psychosocial stress," which is a form of stress that some
people experience as a result of significant life events or having lower levels of optimism or life
satisfaction.
Psychosocial stress may increase fracture risk through degradation of bone mineral density," the
researchers write in their study paper. It alters the bone structure and stimulates bone remodeling
through dysregulation of hormone secretion, including cortisol, thyroid hormones, growth
hormone, and glucocorticoids," they explain.
However, they also note that the potential association between psychosocial stress and bone loss
has been the subject of very few studies, whose findings have been mixed."
In the current research, first author Shawna Follis and colleagues have analyzed the health and
lifestyle data of 11,020 women aged 50–70 who had enrolled in the Women's Health Initiative
(WHI). The WIH is a long-term study that aims to identify preventive strategies for conditions,
including heart disease, breast cancer, and osteoporosis in women.
These participants formed part of a cohort involved in a substudy of WHI that examined data
related to bone density. The researchers collected the data at baseline, at the time of enrolment,
and once again after 6 years.

At baseline, the participants also filled in a questionnaire asking them about levels of
psychosocial stress, specifically as they related to three factors:
The researchers followed the participants for 6 years and found that high levels of psychosocial
stress had links with lower bone density. This association persisted even after the team adjusted
for confounding factors, including age, body mass index (BMI), smoking status, and alcohol use,
among others.
At the same time, some stressors had more weight than others when it came to the association
with bone loss. We identified specific psychosocial stressors pertaining to the social
environment that was associated with bone loss," the study authors write.
The researchers linked higher social strain with greater bone mineral density loss in the hips,
overall, as well as in the lumbar spine (lower back), and specifically the femoral neck (which
forms part of the hip bone).
Additionally, stress derived from social functioning levels was associated with higher bone loss
in the hip, overall, and in the femoral neck, in particular.
But the most important factor seemed to be a social strain, which the researchers measured on a
one to five scale with a total possible score of 20 points, in which the higher scores indicated
greater social strain.
The team found that for each additional point on this scale, the amount of bone loss increased.
More specifically, for each additional point, there was 0.082% higher loss of femoral neck bone
density, a 0.108% higher loss of total hip bone density, and a 0.069% greater loss of lumbar
spine bone density.
Follis and colleagues caution that their findings are only observations, and the associations do
not necessarily speak of a cause and effect relationship. Nevertheless, the study authors argue the
importance of not ignoring the link between the quality of social relationships and the presence
of bone loss.
For this reason, they suggest that older women might benefit from having access to better social
support networks

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