This is the best diet for treating depression

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Many of us turn to comfort foods when we are feeling down, which are generally defined as those dishes and snacks that are easy to make (or order out — thanks, GrubHub GRUB, +3.05% and Postmates — or open from a package) that are filled with nostalgic or sentimental value. (They’re also often loaded with sugar, salt, fat and/or refined carbs.)

But new research shows that we’re doing comfort food all wrong. In fact, cutting out processed foods and adding in more fruits, vegetables and fish doesn’t just make you healthier — it may also make you happier.

A small, randomized trial published in PLOS One this week (just in time for World Mental Health Day) looked at 76 adults ages 17 to 35, who all scored “moderate to high” on a scale of depression symptoms used by doctors, and who also consumed diets that were high in processed foods, saturated fats and refined carbohydrates.

The subjects were split into two groups. One was encouraged to eat healthier by receiving money for grocery shopping, a small hamper of pantry items, as well as tips to eating healthier, whole foods. Researchers checked in on them twice a week for three weeks to see how their diets were going. The control group, on the other hand, didn’t receive any food, money or nutritional guidance.

And at the end of three weeks, those on the diet who ate more fruits, vegetables and fish — aka a Mediterranean-style diet — saw their moods significantly improve, and their “moderate to high” depression scores dropped within a normal range. Those in the control group who had stuck to their less healthy diets didn’t see change to their moods or scores. Three months later, the subjects who continued with the healthy eating habits continued to have elevated moods and more improved life outlooks.

Now, this was a very small trial, and more randomized control trials are needed to establish whether there really is a cause-effect relationship between diets and depression. The control group in this case did nothing, for instance. Future research should compare the outcomes of people who eat healthy with those trying a different intervention, such as social support, to show how effective a new diet would be in comparison.

And no one is saying that simply eating more vegetables can take the place of therapy and medication in treating depression and other mental health conditions.

But as study co-author Heather Francis, a nutritional neuroscience researcher from Macquarie University in Sydney, told Live Science, “These findings add to a growing literature to suggest that healthy diet can be recommended as an effective therapy to improve depression symptoms, as an adjunct to pharmacological and psychological therapy.”

One in five U.S. adults experience mental illness each year, according to the National Alliance on Mental Illness, and one in six U.S. youth ages six to 17 also have a mental health disorder. It’s estimated that serious mental illness causes $193.2 billion in lost earnings in the U.S. alone each year, and costs the global economy $1 trillion annually, NAMI reports.

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