Depressed? It Could Be Your Diet

unhealthy sugar donuts and muffins and tempted young woman or teenager girl sitting on ground worried about overweight in diet and weight loss obsession in unhealthy nutrition concept

 We know that diet affects our energy levels, body weight and risk of diseases including heart disease, diabetes and cancer. But I bet you don’t associate your food choices with mental health. Research is suggesting that what we eat may be as important in treating mental illness as medications and psychotherapy. Check out this guest blog post by Colleen Webb, MS, RDN on diet and depression. With the stressful times we are living in, it may be time to change your diet to prevent or manage depression!

woman eating ice creamDiet for improved psychological health

An article titled “In Search of the Optimal Brain Diet” published in a recent special edition of Scientific American reported on quite a few studies linking healthy dietary patterns to better psychological health.

The article opens with a story about a grieving woman who was eating a lot of junk food and teetering on the edge of depression.  She enrolled in a depression-prevention study where she and half of the other participants were assigned to the control group and received counseling on a “brain healthy” diet.  The other half were placed in the experimental group and underwent a few hours of problem-solving therapy.

As the control, the dietary counseling was not meant to have much effect, but the opposite was true.

Ditching a high sugar, highly processed diet in favor of whole foods significantly reduced risk of depression by roughly the same amount as partaking in problem-solving therapy.


More studies on link between diet and depression

Mediterranean diet Earlier studies have produced similar links between diet and depression:

Another Spanish study, this one from 2013, found that subjects who followed a nut-enriched Mediterranean diet had a lower risk for depression compared with those who ate a generic low-fat diet

Beyond depression

  • Looking beyond depression, a 2015 study showed how a hybrid of the Mediterranean and low-salt DASH diet might help prevent Alzheimer’s.  And, another 2015 study connected poor diet with a shrinking brain!  Pic credit 
  • A traditional Mediterranean diet is high in olive oil, fatty fish, fruits, vegetables, whole grains and legumes, moderate in lean protein, and low in added sugar, highly processed foods, and fatty meat.
  • Besides the Mediterranean-style diet, traditional Japanese and Scandinavian diets are thought to benefit mental health.  A traditional Japanese diet includes colorful vegetables, seaweed, some fish, some meat and limited sugar and white rice, whereas a Scandinavian diet is heavy in fruits, vegetables, nuts, whole grains (especially rye), seafood, canola oil and moderateamounts of meat and dairy.

So … what should you eat/or not eat?

  1. All of these brain healthy diets are full of fruits, vegetables and other powerful anti-inflammatory agents, such as omega-3 fats from fatty fish and seaweed
  2. Arguably the most important nutrient for the evolution and development of the human brain is docosahexaenoic acid (DHA),an omega-3 fat.  DHA plays a role in the development, structure and function of the brain, and it’s thought to increase levels of a protein that contributes to the growth and survival of brain cells.
  3. Fruits, vegetables and other plant foods contain fiber, and fiber is important fuel for beneficial gut microbes.  A balanced gut microbiome is key to good health.
  4. On the flip side, the stereotypical Western diet is full of highly processed foods, sugar and fatty meats, and low in fruits and vegetables.
  5. prebioticsExcessive amounts of sugar and highly processed foods drive uncontrolled inflammation, and inflammation plays a major role in a range of brain disorders as evidenced by elevated markers of inflammation in depressed patients.
  6. Plus, a high sugar diet can inflame the gut resulting in a deficiency of serotonin, a neurotransmitter linked to depression and other mental disorders.  And, eating a high sugar, highly processed food diet has been shown to wipe out important bacterial species in the gut!


Bottom line

sugar cravingsChanging what we eat is the easiest way to support a healthy gut microbiome and control inflammation for bothphysical and mental health, and diet might be as important as medications and therapy in managing mental illness.

Click here for more information on a Mediterranean diet.


I’d like to thank Colleen Webb for writing this guest blog post!


Colleen Webb, MS, RDN is a NYC-based clinical nutritionist, health blogger and speaker with a passion for nutrition, food, and the gut.  She is the founder of Colleen Webb Nutrition and the nutrition blog, Eat For Years.

I love her blog:)



I especially love problem-solving, whether it’s helping women defeat issues plaguing them for years, helping a busy executive find practical ways to get heart healthy, or providing tips to help you reverse diabetes. That’s why I’m on a constant quest to expand my knowledge by staying on top of the latest research.

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