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Are Nutritional Psychologists the New Health Coaches?

Kelsey Tyler

Diet tips aren’t something you’d traditionally seek out from a shrink, but some therapists are starting to offer nutritional advice as part of their counseling. The young field of nutritional psychology (or nutritional psychiatry — the terms are used interchangeably) is a new addition to lifestyle medicine, a movement that advocates for behavioral changes to play a central role in improving patient health outcomes and managing illness

The theory behind nutritional psychology is simple: Dietary changes, such as cutting back on processed foods and loading up on seafood for its omega-3 fatty acids, can have a measurable impact on mental health. Yet despite early, intriguing research on the diet-psychology connection, this emerging field lacks important safeguards, such as standardized treatment protocols or formal training requirements — or regulations of any kind. That’s reason enough, experts say, to take a good, skeptical look at anyone who calls themselves a nutritional psychologist before signing up for their take on yesterday’s breakfast.  

Diet and mental health: what we know

About a decade ago, an Australian research team found the first hints of a connection between diet and common mental disorders such as depression and anxiety. Previous studies had examined how consuming individual foods or nutrients affects mental health. But Felice Jacka, a professor of nutritional and epidemiological psychiatry at Deakin University in Australia, wanted to see if daily eating habits had a meaningful relationship to mental health. So Jacka and her colleagues tracked diet patterns and symptoms of common mental disorders in a group of more than 1,000 women over a 10-year period. They found a clear link between diet quality and depression.

Jacka’s team uncovered the same link in teenagers and Norwegian adults soon afterwards. Then, in a 2017 clinical trial, they found that participants with major depressive disorder who received personalized dietary advice and nutritional counseling reported significantly reduced depressive symptoms. These study participants had modified their diets by loading up on produce, whole grains, legumes and lean protein, and cutting down on sugary and processed foods. “This showed you could help people with clinical depression to make simple, feasible, inexpensive changes to their diets that had a substantial impact on their symptoms,” says Jacka, who is also president of the International Society for Nutritional Psychiatry Research and director of the Food and Mood Centre in Australia.

Most recently, Jacka’s team performed a meta-analysis of 16 clinical nutrition trials, to see if any associations between healthy eating and mental health bore out across a larger pool of research. Dietary changes reduced depressive symptoms, they found, but appeared to have no measurable effect on anxiety.

Other experts are building on Jacka’s work: A different Australian team ran a follow-up study based on her 2017 trial, and published the results this summer. They found that a Mediterranean diet supplemented with fish oil reduced depression symptoms substantially. At this point, a Mediterranean diet is the only kind whose benefits for depression are supported by research.

“Right now, ‘nutritional psychologist’ means a million different things. You have no idea what you are going to get.”

Despite repeated evidence of a link between food and mental health, the exact nature of the link remains unclear. Experts believe a few factors may be at play. First, some foods might promote inflammation (the immune system’s response to invaders), which is a risk factor for depression

Second, “mental health depends on brain health, and brain health depends on food,” says Dr. Drew Ramsey, a psychiatrist and professor at Columbia University. “If you’re missing certain nutrients, such as vitamin B12, iron and omega-3 fatty acids, you will get depressed.” Studies also show that dietary changes can affect the size of the hippocampus, the brain region that’s in charge of memory and learning and is most closely associated with psychiatric disorders

Finally, what we eat affects which types of bacteria live in our guts, which matters because our microbiota might influence our mental health. When scientists transplant fecal matter from humans with schizophrenia or depression into rodents, the animals exhibit behaviors like those of the source humans. Though findings are still inconclusive, other research indicates that probiotics might help those with depression and anxiety.

Nutritional psychology in practice

“[It’s] common sense to pay attention to lifestyle factors” when it comes to mental health, Ramsey says. “What you eat and how much you exercise is critical in getting better from depression and staying better. But it hasn’t been the focus of treatment plans across mental healthcare generally.” 

In his clinic, in addition to a general psychiatric evaluation, Ramsey assesses the content of a patient’s diet, their relationship with food and their level of motivation to make any dietary changes. He then offers concrete strategies to increase intake of healthy foods (primarily plant-based and seafood), replace highly processed foods with healthier options and decrease snacking overall. Others might recommend adding supplements, removing certain foods or going on specific diets. 

That said, since the discipline is unregulated, it’s hard to predict how a nutritional psychologist will approach treatment. There’s no national certification program; experts are more or less self-designated, much like health coaches were until this summer.

“I am passionate about dietary interventions being a possible treatment for psychiatric disorders, including really severe disorders like schizophrenia and bipolar disorder,” says Dr. Chris Palmer, assistant professor of psychiatry at Harvard Medical School and director of the department of postgraduate and continuing education at McLean Hospital. “But right now, ‘nutritional psychologist means a million different things. You have no idea what you are going to get.”

“If we don’t get more rigorous and scientific about this, this field will never advance,” Palmer says. 

With a little googling, you can find the Institute for the Psychology of Eating, which certifies students as “mind body eating coaches”; two universities offering certifications in nutritional psychology; a nine-month online course to become a nutritional therapy consultant; and a six-hour online course in nutritional psychiatry. Some require a certificate or license in nutrition or dietetics; others are open to anyone. 

That means people who call themselves nutritional psychologists might not be licensed as either mental healthcare providers or nutritionists. A practitioner could recommend a diet simply because they think ketogenic is the best or gluten is the devil. They could even sell a patient supplements for profit.

“I’m not against supplements, but as an ethical practitioner, I will tell my patients where to go and buy them so there is no conflict of interest, says registered dietitian nutritionist Angela Lemond, spokesperson for the Academy of Nutrition and Dietetics.

A title as official-sounding as “nutritional psychologist” could also give the false impression that eating wild salmon and kale will resolve your condition, Ramsey says. “Mental health disorders are really personal and really complex,” he adds. “This is not meant to be a replacement for other treatments,” such as therapy and medication, but instead is meant to be used in conjunction with those things.

Your health comes first

While exciting, nutritional psychology is still very young. Some leaders in the field are calling for regulation and standardization of care. Jacka and her colleagues at the Food and Mood Centre are working with an international team of experts to develop clinical guidelines for practitioners on how to use lifestyle changes as the foundation for treating mental disorders.

In the meantime, for anyone interested in using nutrition to support mental health, most experts recommend seeing both a mental health professional and a dietitian. There are also practical benefits of seeking out licensed providers. While insurance should cover mental healthcare and nutritional care, services furnished by a nutritional therapist might not make the cut. 

No matter who you see, check out their education and experience, and ask not only what type of care they provide but also what evidence they have that their treatment method works. And don’t neglect other forms of care. “This alone is not going to cure you,” Palmer adds. “This is one part of a comprehensive treatment plan. So many factors go into mental health, and diet and dietary interventions can be part of that.”

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Show Comments (4)
  1. Colleen

    Diet plays a very important role in how we feel. I found out just a couple of years ago that I am gluten and lactose intolerant and issues with sugar. For so many years I was literally ill all the time and I had no idea that I had these in tolerances. If I accidentally ingest gluten or lactose I get to feeling horrible very quickly, like I am literally about to die. So I know that when on a proper diet, one tends to feel better. When I was diagnosed with MDD 30 years ago my psychiatrist told me that food had nothing to do with it. I understand that I need to be on medication for the rest of my life, but I do know that had I been eating the right things that it could have helped me to feel better and to feel “more well”, for lack of a better term. Food does make a difference.

  2. Jane Spaulding

    This is a good report, but I will tell you much more. I care and know from my own experience quite a bit more and I must share this now. Orthomolecular medicine is what finally replaced the serotonin and the other medically prescribed neuroleptic, psychotropic, habit-forming and damaging drugs the psychiatrists gave me.

    I trusted M.D.s and they kept me on them for forty years. It all started just three months after I gave birth to my first child. The psychiatrists were all totally wrong and the same psychiatrist who mis-diagnosed me as psychotic and started me on this erroneous and rather crippling path claimed I was still mentally ill with an anxiety disorder forty years later. At our last consultation he did not know or explain clinical anxiety compared to normal anxiety which prompts one to pay the bills, keep a car well maintained, deal with buying, remodeling a home, landscaping and, don’t forget, raising one’s child alone all those years.

    By that time, I was under another doctor’s care, a D.O, an Osteopath, who was perfectly well informed as to the deepest benefits of nutrition which involves the correct chemical balance found in foods as well as nutritional supplements. Soon after my last consultation with this particular M.D., the psychiatrist, he retired!

    Pregnancy and nursing the newborn child on demand every two hours is what weakened my system and led my husband to this M.D., the Psych Ward and to believe the M.D. Thank God, I had parents and two friends prevent this M.D. from giving me shock treatments! I remember everything that was done to me and see that being treated like a wild animal, forced to received a tranquilizer and then chained to the bed, ankles and wrists, forced to ingest drugs and have my breasts bound to prevent further lactation while I was quiet, not making a sound and totally cooperative was a horrible and deeply damaging experience at the hands of cruel, narrow-minded doctors with a medieval mind-set! They would use psychotropic pills like candy. Their method seemed to be ” try this, now try that.”

    Enough of this confusion, medical students! Dig deeper. Find the truth. Get off the drugs! Get the facts about human body chemistry connected with natural chemical components in food and nature. Connect humans to their source that’s already there in nature, the minerals, elements and the health giving food. Each person has a unique chemical make-up and a chemical analysis shows the body’s composition in the lab reports as to what’s needed to get re-balanced.

    The serotonin re-uptake inhibitors shut down half the brain causing a kind of a black-out. Over
    the years I suffered from more problems like depression, weakness on one side of my body head to toes, irregular heart-beat, then helped with a pace-maker and now insomnia. Please study my comment and reply as you may be guided. Is there some way you can send me a copy of this comment as it has been very rewarding for me to find you and your article so that I can share my truth with those who care and respect this kind of disclosure.

    Thank you for your interest. Jane Spaulding

  3. Muriel H.

    Easy cure for PVCs. A choline source like lecithin and B5 (pantothenic acid.)

  4. Michele

    Jane you are 100% correct in the absolute incorrectness in how depression is treated. I am sorry for your horrible mistreatment and it’s Alive and well sadly today. BUT the correct info IS out – HAS been used – look up William Walsh at and
    Orthomecular Medicine or Integrative Medicine – they are changing lives thru testing – properly diagnosing of the root causes of all mental health disorders – thru simple blood and urine testing – then targeted nutrient therapy individualized for each persons individual biochemistry.
    Walsh, a scientist has discovered 5 Bio types of Depression and logically 5 different treatments for each. No drugs. Certain nutrients – in specific doses – under care of a trained practitioner can correct and REVERSE the disorder using this therapy. Read the research – it’s wonderful AND works! Over 80% success rate. Usually a person can stop the drugs – after stabilizing on the nutrients. In more a severe cases a med may remain but lower dose WITH the nutrients.
    Mensah Medical healed my son’s bipolar disorder over ten years ago. They have helped thousands of patients. They are also training doctors this “Walsh Method”
    But in my opinion Mensah is the worlds best. This is integrative medicine that will change the world!

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