Nav: Home

Walnut consumers tend to have lower prevalence of depression symptoms, says new study

February 07, 2019

FOLSOM, Calif., February 7, 2019 - A new epidemiological study suggests consuming walnuts may be associated with a lower prevalence and frequency of depression symptoms among American adults.1 After evaluating study participants for depression, researchers found that depression scores were 26 percent lower for walnut consumers and eight percent lower for consumers of other nuts, compared to those who did not consume nuts at all.

"According to the CDC, one out of every six adults will have depression at some time in their life. It is important to find low-cost interventions, such as dietary changes, that are easy to implement and may help reduce the incidence of depression," says lead investigator Dr. Lenore Arab of the David Geffen School of Medicine at The University of California, Los Angeles. "Walnuts have previously been investigated for their role in cardiovascular and cognitive health, and now we see an association with depression symptoms - providing another reason to include them in a healthy eating plan."

Researchers examined data from the National Health and Nutrition Examination Survey, which draws from a large sampling of the U.S. population. More than 26,000 American adults were asked about their dietary intake over the course of one to two days as well as depression symptoms over the past two weeks. Using a widely accepted questionnaire, participants ranked how often they experienced factors such as little interest in doing things, trouble sleeping or sleeping too much, feeling tired or having little energy, and trouble concentrating on things. According to the findings, walnut consumers were more likely to have greater interest in activities, higher energy levels, less hopelessness, better concentration, and greater optimism.

Depression scores were significantly lower among those who consumed nuts, particularly walnuts, compared to those who did not consume nuts, even after controlling for age, sex, race, income, BMI, smoking, alcohol consumption, and marital status. On average, walnut consumers ate about 24 grams of walnuts per day (just shy of a one-quarter cup serving). While the association between nut consumption and depression scores was consistent for men and women, the effect appeared to be strongest among women, who are more likely to report greater depression symptoms and use of antidepressants, compared to men.

When compared to other tree nuts, walnuts have a unique fatty acid profile - they contain mostly polyunsaturated fats, including a significant amount of the plant-based omega-3 alpha-linolenic acid (2.5 g/oz), which is more than any other nut.

As with any scientific research, some study limitations should be considered. Participants were asked about their dietary choices over the course of one to two days, which may not be representative of usual consumption patterns. Depression may also change typical appetite and eating behaviors. In addition, because of the cross-sectional nature of the study, the findings cannot prove causality.

Funding for this research was provided by the California Walnut Commission (CWC). The CWC has supported health-related research on walnuts for more than 25 years. While the CWC does provide funds and/or walnuts for various projects, the actual studies are conducted independently by researchers who design the experiments, interpret the results and write the manuscripts.
-end-
About California Walnut Commission

The California Walnut Commission, established in 1987, is funded by mandatory assessments of the growers. The Commission is an agency of the State of California that works in concurrence with the Secretary of the California Department of Food and Agriculture (CDFA). The CWC is mainly involved in health research and export market development activities. For more industry information, health research and recipe ideas, visit http://www.walnuts.org.

Non-Discrimination Statement

The California Walnut Commission (CWC) prohibits discrimination in all programs and activities on the basis of race, color, national origin, age, disability, sex, marital status, familial status, parental status, religion, sexual orientation, genetic information, political beliefs, reprisal, or because all or part of an individual's income is derived from any public assistance programs. Persons with disabilities who require alternative means for communication of program information (Braille, large print, audiotape, etc.) should contact the CWC offices at (916) 922-5888. To file a complaint of discrimination, write to USDA, Director, Office of Civil Rights, 1400 Independence Avenue, S.W., Washington, D.C. 20250-9410, or call (800) 795-3272 (voice) or (202) 720-6382 (TDD). CWC is an equal opportunity employer and provider.

The California Walnut Commission offices are located at 101 Parkshore Dr., Ste. #250, Folsom, CA 95630

Reference: 1 Arab L, Guo R, Elashoff D. Lower Depression Scores among Walnut Consumers in NHANES. Nutrients. 2019;11(2):275. doi.org/10.3390/nu11020275

Edelman Seattle

Related Depression Articles:

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.
Anxiety and depression linked to migraines
In a study of 588 patients who attended an outpatient headache clinic, more frequent migraines were experienced by participants with symptoms of anxiety and depression.
More Depression News and Depression Current Events

Top Science Podcasts

We have hand picked the top science podcasts of 2019.
Now Playing: TED Radio Hour

Risk
Why do we revere risk-takers, even when their actions terrify us? Why are some better at taking risks than others? This hour, TED speakers explore the alluring, dangerous, and calculated sides of risk. Guests include professional rock climber Alex Honnold, economist Mariana Mazzucato, psychology researcher Kashfia Rahman, structural engineer and bridge designer Ian Firth, and risk intelligence expert Dylan Evans.
Now Playing: Science for the People

#540 Specialize? Or Generalize?
Ever been called a "jack of all trades, master of none"? The world loves to elevate specialists, people who drill deep into a single topic. Those people are great. But there's a place for generalists too, argues David Epstein. Jacks of all trades are often more successful than specialists. And he's got science to back it up. We talk with Epstein about his latest book, "Range: Why Generalists Triumph in a Specialized World".
Now Playing: Radiolab

Dolly Parton's America: Neon Moss
Today on Radiolab, we're bringing you the fourth episode of Jad's special series, Dolly Parton's America. In this episode, Jad goes back up the mountain to visit Dolly's actual Tennessee mountain home, where she tells stories about her first trips out of the holler. Back on the mountaintop, standing under the rain by the Little Pigeon River, the trip triggers memories of Jad's first visit to his father's childhood home, and opens the gateway to dizzying stories of music and migration. Support Radiolab today at Radiolab.org/donate.