How do anxiety and depression affect physical health?

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Depression and anxiety may be just as bad for your health as smoking and obesity. However, cancer does not correlate with these mental health conditions. These are the main takeaways of a new study that investigates the physical health risks of these psychiatric conditions.

In the 17th century, Enlightenment philosopher Rene Descartes posited that the mind and the body were separate entities.

While this dualist idea has shaped much of modern science and thought, recent scientific advances show that the dichotomy between the mind and the body is a false one.

For instance, neuroscientist Antonio Damasio famously wrote the book he entitled “Descartes’ error” to prove precisely the point that our brains, emotions, and judgment are much more intertwined than people previously believed.

The findings of a new study may further contribute to this latter argument. Aoife O’Donovan, Ph.D., of the Department of Psychiatry at the University of California San Francisco, and her colleague Andrea Niles, Ph.D., set out to examine the effects that psychiatric conditions, such as depression and anxiety, may have on a person’s physical health.

The researchers investigated the health of more than 15,000 seniors over 4 years and published their findings in Health Psychology, the journal of the American Psychological Association.

The study looked at the health data of 15,418 retirees who were 68 years old, on average. The data came from a governmental study that used interviews to assess the participants’ symptoms of anxiety and depression.

The participants also answered questions about their weight, smoking status, and medical conditions they had a diagnosis of. In addition, they provided information about weight recordings from hospital visits.

Of the total number of participants, O’Donovan and colleagues found that 16 percent had high levels of anxiety and depression, 31 percent had obesity, and 14 percent were smokers.

Those living with high levels of anxiety and depression were 65 percent more likely to develop a heart condition, 64 percent more likely to have a stroke, 50 percent more likely to develop high blood pressure, and 87 percent more likely to have arthritis than people who did not have anxiety or depression.

“These increased odds are similar to those of participants who are smokers or are obese,” says O’Donovan. “However,” she adds, “for arthritis, high anxiety and depression seem to confer higher risks than smoking and obesity.”

Of all the conditions investigated, the scientists found that cancer was the only one that did not correlate with anxiety and depression. These findings confirm previous studies, explain the researchers, but they run against the belief that many patients share.

“Our findings are in line with a lot of other studies showing that psychological distress is not a strong predictor of many types of cancer,” says O’Donovan.

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