Anyone who has cozied up with a bowl of mac and cheese after a hard day will agree that food can trigger feelings of happiness and comfort. The idea that food affects mood is a familiar one. But the emerging field of nutritional psychiatry aims to better understand how overall diet and specific nutrient intake can influence mental health, and apply it in a clinical setting. Psychiatrists and researchers are beginning to consider their patients鈥� eating habits an integral part of addressing mental health conditions like anxiety and depression, making diet recommendations in addition to providing psychotherapy and (in some cases) prescription medication.
The question of how to put the food-mood connection into practice is a hard one to answer. Nutritional psychiatry research is still in its early stages; so far, most of it points to eating the same type of diet that has long been recommended for physical health. And while a healthy eating prescription sounds simple and harmless enough, too much focus on eating the 鈥渞ight鈥� foods can actually worsen mental health. Here鈥檚 what you should know before you start applying any food-mood principles in your own life.
An Up-and-Coming Field
The International Society for Nutritional Psychiatry Research, which coined the phrase 鈥渘utritional psychiatry,鈥� was established in 2013. Its founder and president, is a professor at Deakin University School of Medicine in Australia, where she researches the link between diet and mental health. The 听now boasts hundreds of members, all practitioners or researchers in psychiatry and related fields. Psychiatrists at prominent institutions like and are teaching and applying nutritional psychiatry. And media outlets from to are helping popularize the approach.
It鈥檚 an exciting notion, but it鈥檚 worth approaching the field with some skepticism. The market is filled with companies and people interested in turning a profit: unregulated supplements with names like and make vague promises about making you feel happier or lessening your anxiety. Influencers and health coaches make anecdotal鈥攁nd dubious鈥攃laims that and .
What you eat, of course, impacts how your brain functions. The brain needs calories to operate, and chemical messengers travel back and forth between your gut and brain via the vagus nerve triggering all sorts of functions, from hormone production to cognition. But researchers are excited about the prospect of finding concrete associations between specific nutrients and mental health.
The most well-supported recommendation in nutritional psychiatry is the use of omega-3 fatty acids to help treat and prevent depression. 础听听published in听狈补迟耻谤别听analyzed data from 26 existing randomized controlled trials, which included a total of 2,160 participants, all adults with diagnosed clinical depression. The authors found that a daily dose of one gram of omega-3 fatty acid was associated with a significant improvement in depressive symptoms. It鈥檚 not totally clear why, but researchers guess that it鈥檚 due to both omega-3 fatty acid鈥檚 anti-inflammatory effects and their role in producing compounds that support brain function. One important note is that they were looking at omega-3 supplements, not omega-3s from food sources like .
A of 213 studies, published in the World Journal of Psychiatry, sought to identify other nutrients that are critical to mental health. The authors identified 12 essential nutrients that, based on existing evidence, seem to be associated with the prevention and treatment of depressive symptoms: folate, iron, omega-3 fatty acids, magnesium, potassium, selenium, thiamine, vitamin A, vitamin B6, vitamin B12, vitamin C, and zinc. The authors then assigned an 鈥渁ntidepressant food score鈥� to various foods, based on their concentration of these nutrients. The highest-scoring foods were leafy green vegetables, organ meats, oysters, clams, and mussels. Other types of seafood, fruits, and vegetables also made the list.
We know these nutrients play a role in the biological pathways related to depression, but the evidence isn鈥檛 enough to confidently conclude that getting more of them actually alleviates depression. Just because a nutrient affects a particular pathway, doesn鈥檛 mean that it will necessarily have an impact on the outcome (in this case, depression).听
Even though we鈥檙e still in the early phases of identifying powerhouse nutrients, research does support the association between mental health and certain eating patterns. There鈥檚 that a healthy gut microbiome filled with a diverse set of probiotic (good) bacteria has a positive impact on mood and mental health, among other things. Probiotics produce hundreds of neurochemicals that your brain uses to regulate many physical and mental processes in your body, the explains. For example, 95 percent of our body鈥檚 serotonin (the neurotransmitter that helps regulate mood) is produced by probiotics in the gut.听The best way to support your probiotic bacteria is to feed them prebiotic fiber, found in whole, plant foods like fruits and vegetables. On the other hand, processed foods and simple sugars can feed less-healthy gut bacteria, so too much of these things can cause harm.
础听 published in Molecular Psychiatry found an overall association between a Mediterranean diet鈥攈igh intake of plant foods, moderate intake of fish and poultry, and olive oil as the main source of fat鈥攁nd lower risk of depression, although not every study they included supported this conclusion. The same review found a loose, inconclusive link between eating fewer processed foods and a lower risk of depression.
Putting Theory into Practice
, a psychiatrist and the director of nutritional and lifestyle psychiatry at Massachusetts General Hospital, became interested in nutritional psychiatry early in her career. She recommended simple adjustments to one of her patient鈥檚 nutrition while treating him for depression. First, he cut back on his daily coffee鈥攚hich he took with ample creamer and several spoons of sugar. Then, he worked on replacing processed food with more fruits and vegetables. 鈥淚t really made a difference in his care and his treatment and our therapeutic relationship,鈥� she says.
Now works with several patients who suffer from depression and anxiety to improve their overall听diet quality,听with small tweaks like increasing their intake of whole foods and decreasing their consumption of processed food and added sugar. She checks in with patients about their progress during their regular psychotherapy sessions. In general, this approach is best suited to patients whose diets are high in processed foods to start with, and who are able, financially and otherwise, to make dietary changes. Naidoo says that she鈥檚 seen many of her patients鈥� symptoms improve as a result.
In some ways, it鈥檚 similar to the work that registered dietitians do, but Naidoo explains that nutritional psychiatry is just one tool in her practice, and it doesn鈥檛 exclude the use of other forms of therapy or medication. Medication can be life-saving for patients with certain mental health disorders. 鈥淚t is meant to be a complement, and offer more solutions to improving mental wellbeing,鈥� she says.
Keep It Simple
Eating nutritious foods can absolutely support mental health, but some mental health experts worry that prescriptive nutritional psychiatry may encourage patients to be overly vigilant about what they eat.听
鈥溾€嬧€婽he first thing that I think of when I hear about nutritional psychiatry is 鈥榞reat鈥攅ven more pressure to eat perfectly,鈥欌€� says , a psychologist who specializes in food and body image concerns. Our cultural fixation on healthy eating is already harmful to many people鈥檚 mental health; orthorexia, a damaging obsession with a rigid idea of healthy eating, is now recognized by many experts as an eating disorder (although it鈥檚 not yet in the Diagnostic and Statistical Manual used across the field to identify mental disorders). And while nutritional psychiatry doesn鈥檛 necessarily mean 鈥渆at only nutritious foods all the time,鈥� it can be interpreted this way.
Daniels also points out that the sense of empowerment people may feel with nutritional psychiatry鈥攊mproving their mood through their own food choices instead of relying solely on medication and psychotherapy鈥攃an backfire. Eating seems like something you can control, but being too strict can lead to unmanageable feelings around food, and shame whenever you slip up.
Nutritional psychiatry is still in its infancy. So, for now, think of it as a field to watch. Yes, small changes in how you eat can be sustainable, particularly if they have a noticeably positive impact on your mental health. But there鈥檚 so much room for misinterpretation here that it鈥檚 worth taking the food-mood connection with a grain of salt.
Food is more than the sum of its nutrients. It is also a source of comfort, joy, and connection, all of which are important for mental health. Too much focus on food can lead to stress, anxiety, and guilt. The only conclusion we can confidently take away from existing research is to keep eating the same type of diet that鈥檚 long been recommended for physical health: lots of whole foods, fruits and veggies, and a good balance of macros from a variety of sources. Most importantly, make sure that any diet changes you make鈥攆or any reason鈥攍eave room for finding pleasure in eating. If you鈥檙e going to change your eating habits in the name of better mental health, make sure those changes are actually having that effect.