A study has found that poor mental health is linked with poor diet quality—regardless of personal characteristics such as gender age, education, age, marital status and income level.
February 21, 2019, Loma Linda, CA—The study, published Feb. 16 in the International Journal of Food Sciences and Nutrition, revealed that California adults who consumed more unhealthy food were also more likely to report symptoms of either moderate or severe psychological distress than their peers who consume a healthier diet.
Jim E. Banta, PhD, MPH, associate professor at Loma Linda University
School of Public Health and lead author of the study, said the results
are similar to previous studies conducted in other countries that have
found a link between mental illness and unhealthy diet choices.
Increased sugar consumption has been found to be associated with bipolar
disorder, for example, and consumption of foods that have been fried or
contain high amounts of sugar and processed grains have been linked
“This and other studies like it could have big implications for
treatments in behavorial medicine,” Banta said. “Perhaps the time has
come for us to take a closer look at the role of diet in mental health,
because it could be that healthy diet choices contribute to mental
health. More research is needed before we can answer definitively, but
the evidence seems to be pointing in that direction.”
Banta cautioned that the link found between poor diet and mental
illness is not a causal relationship. Still, he said the findings from
California build upon previous studies and could affect future research
and the approaches that healthcare providers administer for behavioral
In their study, Banta and his team reviewed data from more than
240,000 telephone surveys conducted between 2005 and 2015 as part of the
multi-year California Health Interview Survey (CHIS). The CHIS dataset
includes extensive information about socio-demographics, health status
and health behaviors and was designed to provide statewide
approximations for regions within California and for various ethnic
The study found that nearly 17 percent of California adults are
likely to suffer from mental illness — 13.2 percent with moderate
psychological distress and 3.7 percent with severe psychological
The study stated that the team’s findings provide “additional evidence that public policy and clinical practice should more explicitly aim to improve diet quality among those struggling with mental health.” It also stated that “dietary interventions for people with mental illness should especially target young adults, those with less than 12 years of education, and obese individuals.”
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