A new study has added to the existing evidence that a healthy and balanced diet could help reduce the symptoms of depression. The study titled, “A brief diet intervention can reduce symptoms of depression in young adults – A randomized controlled trial”, was published this week in the latest issue of the journal PLOS One.
The researchers found that a diet comprising of plenty of fruits and vegetables and fresh products as opposed to processed foods could help people with depression. Following a Mediterranean style diet for just three weeks was associated with a decline in the depression score in a group of young adults. These participants with moderate depression came down to normal range with no depression and lower levels of stress and anxiety.
Piccia Neri | Shutterstock
The authors wrote that there is evidence that depression and poor diet choices go hand in hand. They explained that to date there has been only a single randomized controlled trial that studied the effects of dietary intervention on depression symptoms.
No studies of this kind have been performed on young adults, say the researchers. This age group is particularly vulnerable to anxiety, stress and depression as well as poor diet choices.
For the study, the team included 40 participants each (a total of 101 participants) was recruited in the Diet Group or control group. These participants were aged between 17 and 35 years and had a score of 7 and over on the Depression, Anxiety and Stress Scale-21 Depression subscale (DASS-21-D). They had been diagnosed with moderate or higher depression symptoms.
They also had a score of over 57 on the Dietary Fat and Sugar Screener (DFS) indicating a poor diet. Those who were on antidepressant treatment or psychological therapy were included only if they had been on the medication or therapy for two weeks prior to the inclusion in the study.
The participants were now divided into a brief 3-week diet intervention or Diet Group and a habitual diet control group or Control Group. At the end of the study depression scores were measured using Centre for Epidemiological Studies Depression Scale; CESD-R; and Depression Anxiety and Stress Scale– 21 depression subscale; DASS-21-D, Profile of Mood States, New General Self-Efficacy Scale and Hopkins Verbal Learning Test (for memory).
Participants were tested for compliance with their diets using self-report questionnaires and spectrophotometry. Skin yellowness could estimate the amount of “flavonoids (chemicals from fruit and vegetables) in their diet” wrote the researchers. So in addition to questionnaires on diet adherence, they also used a spectrophotometer to see the colour of the palms of the hand of the participants.
A surprising result
Results showed that the Diet group had lower self-reported depression symptoms on the CESD-R and DASS-21 depression subscale compared to controls. Three months after the study the participants were followed up using phone calls and the low depression scores were maintained in the Diet group. The scores among the control group remained similar at the end of the study.
We were quite surprised by the findings. I think the next step is to demonstrate the physiological mechanism underlying how diet can improve depression symptoms. Highly processed foods increase inflammation… if we don’t consume enough nutrient-dense foods, then this can lead to insufficiencies in nutrients, which also increases inflammation.”
Heather Francis, Study Author & Lecturer in Clinical Neuropsychology
Francis explained that the Diet group was eating six more servings of fruits and vegetables per week and she added, participants “who had a greater increase in fruit and vegetable intake showed the greatest improvement in depression symptoms.”
All participants were asked to take more of whole grains, at least three servings of protein from lean meats, poultry, beans, tofu, and eggs. They were also asked to take at least three servings of fish per week.
They were also asked to take at least three servings of unsweetened dairy per week. They were taking three tablespoons of nuts and seeds (walnuts, almonds, pepitas, sunflower seeds) and two tablespoons of olive oil per day. In addition, they were taking spices such as turmeric and cinnamon in their food.
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