Nav: Home

Being overweight likely to cause depression, even without health complications

November 13, 2018

A largescale genomic analysis has found the strongest evidence yet that being overweight causes depression, even in the absence of other health problems.

The research, jointly led by the University of Exeter and the University of South Australia, suggests that it is the psychological impact of being overweight that causes depression, rather than associated illnesses. This furthers understanding of the complex relationship between obesity and depression. While it has long been known that depression is more common in obesity, the research, published in the International Journal of Epidemiology, is the first to conclude that higher body mass index (BMI) can cause depression in itself, even where no other health problems exist.

The team looked at UK Biobank data from more than 48,000 people with depression and compared them to more than 290,000 controls in the UK Biobank cohort of people born between 1938 and 1971, who have provided medical and genetic information. They used hospital admission data and self-reporting to determine whether people had depression.

The team used a genetic research approach to explore the causal link between the two conditions. The team separated out the psychological component of obesity from the impact of obesity related health problems, using genes associated with higher BMI but lower risk of diseases like diabetes. These genes were just as strongly associated with depression as those genes associated with higher BMI and diabetes. This suggests that higher BMI causes depression both with and without related health issues. This effect was stronger in women than in men.

Dr Jess Tyrrell, of the University of Exeter Medical School, said: "Obesity and depression are both global health problems that have a major impact on lives and are costly to health services. We've long known there's a link between the two, yet it's unclear whether obesity causes depression or vice-versa, and also whether it's being overweight in itself or the associated health problems that can cause depression. Our robust genetic analysis concludes that the psychological impact of being obese is likely to cause depression. This is important to help target efforts to reduce depression, which makes it much harder for people to adopt healthy lifestyle habits."

The team tested their results in a second large-scale cohort, using data from the Psychiatric Genomics Consortium. They reached the same conclusion, verifying their results.
-end-
The full paper, entitled Using genetics to understand the causal influence of higher BMI on depression, is published in International Journal of Epidemiology. Authors are Jessica Tyrrell, Anwar Mulugeta, Andrew R. Wood, Ang Zhou, Robin N. Beaumont, Marcus A. Tuke, Samuel E. Jones, Katherine S. Ruth, Hanieh Yaghootkar, Seth Sharp, William D. Thompson, Yingjie Ji, Jamie Harrison, Rachel M. Freathy, Anna Murray, Michael N. Weedon, Major Depressive Disorder Working Group of the Psychiatric Genomics Consortium, Cathryn Lewis, Timothy M. Frayling, Elina Hyppönen.

University of Exeter

Related Depression Articles:

Why stress doesn't always cause depression
Rats susceptible to anhedonia, a core symptom of depression, possess more serotonin neurons after being exposed to chronic stress, but the effect can be reversed through amygdala activation, according to new research in JNeurosci.
Which comes first: Smartphone dependency or depression?
New research suggests a person's reliance on his or her smartphone predicts greater loneliness and depressive symptoms, as opposed to the other way around.
Depression breakthrough
Major depressive disorder -- referred to colloquially as the 'black dog' -- has been identified as a genetic cause for 20 distinct diseases, providing vital information to help detect and manage high rates of physical illnesses in people diagnosed with depression.
CPAP provides relief from depression
Researchers have found that continuous positive airway pressure (CPAP) treatment of obstructive sleep apnea (OSA) can improve depression symptoms in patients suffering from cardiovascular diseases.
Post-natal depression in dads linked to depression in their teenage daughters
Fathers as well as mothers can experience post-natal depression -- and it is linked to emotional problems for their teenage daughters, new research has found.
Being overweight likely to cause depression, even without health complications
A largescale genomic analysis has found the strongest evidence yet that being overweight causes depression, even in the absence of other health problems.
Don't let depression keep you from exercising
Exercise may be just as crucial to a depression patient's good health as finding an effective antidepressant.
Having an abortion does not lead to depression
Having an abortion does not increase a woman's risk for depression, according to a new University of Maryland School of Public Health-led study of nearly 400,000 women.
Mother's depression might do the same to her child's IQ
Roughly one in 10 women in the United States will experience depression, according to the Centers for Disease Control and Prevention.
Teenage depression linked to father's depression
Adolescents whose fathers have depressive symptoms are more likely to experience symptoms of depression themselves, finds a new Lancet Psychiatry study led by UCL researchers.
More Depression News and Depression Current Events

Trending Science News

Current Coronavirus (COVID-19) News

Top Science Podcasts

We have hand picked the top science podcasts of 2020.
Now Playing: TED Radio Hour

Uncharted
There's so much we've yet to explore–from outer space to the deep ocean to our own brains. This hour, Manoush goes on a journey through those uncharted places, led by TED Science Curator David Biello.
Now Playing: Science for the People

#556 The Power of Friendship
It's 2020 and times are tough. Maybe some of us are learning about social distancing the hard way. Maybe we just are all a little anxious. No matter what, we could probably use a friend. But what is a friend, exactly? And why do we need them so much? This week host Bethany Brookshire speaks with Lydia Denworth, author of the new book "Friendship: The Evolution, Biology, and Extraordinary Power of Life's Fundamental Bond". This episode is hosted by Bethany Brookshire, science writer from Science News.
Now Playing: Radiolab

Dispatch 2: Every Day is Ignaz Semmelweis Day
It began with a tweet: "EVERY DAY IS IGNAZ SEMMELWEIS DAY." Carl Zimmer – tweet author, acclaimed science writer and friend of the show – tells the story of a mysterious, deadly illness that struck 19th century Vienna, and the ill-fated hero who uncovered its cure ... and gave us our best weapon (so far) against the current global pandemic. This episode was reported and produced with help from Bethel Habte and Latif Nasser. Support Radiolab today at Radiolab.org/donate.