Gut-Brain Communication in OCD

Overview

Obsessive-Compulsive Disorder (OCD) is a debilitating mental health condition characterized by persistent, intrusive thoughts (obsessions) and repetitive behaviors (compulsions). Some examples of OCD symptoms include:

• Doing tasks in a specific order
• Counting items such as steps or pens
• Rituals such as washing or cleaning
• Rechecking locked doors, or oven
• Fear of being contaminated by items in the environment
• Intense stress when objects or the environment is not orderly or facing a certain way

OCD can significantly impair the quality of life, affecting millions worldwide. Some symptoms we see in clients include inability to use cooking equipment such as a stove for fear of leaving it turned on, limited variety of foods, fear of leaving their home for exercise, therapy or fresh air for risk of contamination from the environment, or undereating if certain foods are unavailable at the grocery. Traditional treatments, such as selective serotonin reuptake inhibitors (SSRIs) and cognitive-behavioral therapy (CBT), offer relief for many patients, but not all. This has led researchers to explore alternative and complementary approaches to better understand and treat the disorder.

One such approach gaining attention is the role of the gut microbiome in the pathophysiology of OCD. In a recent review by Bendriss, MacDonald, and McVeigh (2023), titled “Microbial Reprogramming in Obsessive-Compulsive Disorders: A Review of Gut-Brain Communication and Emerging Evidence,” the authors delve into the emerging connection between gut microbiota and brain function, and its potential implications for OCD. This article synthesizes current research on how gut microbiota may influence brain activity, particularly in relation to OCD, and discusses the mechanisms underlying this gut-brain axis, and provides some concrete strategies we can address clinically.

The Gut-Brain Axis: A Bidirectional Communication Network

The concept of the gut-brain axis (GBA) refers to the complex, bidirectional communication between the gut and the brain. This communication is facilitated by multiple pathways, including the vagus nerve, the immune system, and the endocrine system, as well as the gut microbiome itself. The gut microbiota—trillions of microorganisms residing in the gastrointestinal tract—has been shown to influence both the physiological and psychological aspects of brain function.

The review highlights how gut microbiota are essential for maintaining the integrity of the gut barrier, regulating inflammation, and supporting the production of neurotransmitters that affect brain function. These findings suggest that an imbalance in the gut microbiome, or dysbiosis, can have profound effects on mental health, including disorders such as OCD.

Mechanisms Linking Gut Microbiota to OCD

There are several key mechanisms through which the gut microbiome might influence the development and progression of OCD. These mechanisms include:

1. Neurotransmitter Regulation:
   • One of the most prominent connections between the gut microbiome and the brain is the production of neurotransmitters. Gut microbes are known to synthesize and modulate key neurotransmitters, including serotonin, dopamine, GABA, and glutamate.
   • Serotonin, in particular, is a neurotransmitter implicated in OCD. Approximately 90% of serotonin in the body is produced in the gut, and gut dysbiosis can affect serotonin levels, influencing mood, behavior, and cognitive function. Imbalances in serotonin transmission are linked to OCD symptoms, as well as other mood disorders.
   • Similarly, dopamine, which plays a role in reward processing and compulsive behavior, can also be influenced by gut microbial activity. Anomalies in dopamine regulation may contribute to the repetitive behaviors seen in OCD.
2. Immune System Activation:
   • The gut microbiome plays a crucial role in modulating the immune system. Dysbiosis can lead to the overactivation of the immune response, resulting in inflammation in both the gut and the brain. Chronic low-grade inflammation is associated with several psychiatric disorders, including OCD.
   • Specifically, microglial cells, which are the brain’s primary immune cells, can become activated during systemic inflammation, potentially leading to neuroinflammation in areas of the brain involved in OCD, such as the orbitofrontal cortex and striatum. This could contribute to the cognitive rigidity and compulsive behaviors characteristic of the disorder.
3. Vagus Nerve Signaling:
   • The vagus nerve, which starts at the brain stem and terminates in the gut, is another critical pathway through which the gut microbiome can influence brain function. The vagus nerve carries signals between the gut and the brain (estimates of 80% are from gut to brain, 20% from brain to gut), impacting processes such as mood regulation, stress responses, and cognitive function.
   • Emerging research suggests that gut microbes can modulate vagal nerve activity, potentially altering brain regions involved in anxiety, stress, and compulsive behaviors, such as the prefrontal cortex and cingulate cortex. Disruptions in vagal signaling may therefore play a role in the pathogenesis of OCD.
4. Gut Barrier Function and Systemic Toxicity:
   • The gut barrier is essential for protecting the body from harmful pathogens and preventing the leakage of toxic substances into the bloodstream. Dysbiosis can compromise the gut barrier, leading to leaky gut syndrome and the systemic spread of microbial products such as lipopolysaccharides (LPS).
   • These products can trigger systemic inflammation and activate immune responses that affect brain function. In the context of OCD, this dysregulated immune response may exacerbate the neuroinflammation and neurochemical imbalances that underlie the disorder.

Clinical Implications

What doe all of this mean for how we approach OCD from a nutrition and supplement lens?

In animal studies, researchers have shown that the transfer of gut microbiota from OCD-affected rodents to germ-free animals can induce OCD-like symptoms in the recipient animals. This provides compelling evidence that the microbiome may play a direct role in influencing OCD behaviors. Furthermore, interventions aimed at correcting dysbiosis, such as probiotics or fecal microbiota transplants (FMT), have demonstrated potential in alleviating OCD-like symptoms in these models.

Human studies are still in the early stages, but some findings suggest that individuals with OCD may exhibit altered gut microbiomes compared to healthy controls. For example, studies have observed differences in the abundance of certain bacterial species in individuals with OCD, such as Firmicutes and Bacteroidetes, which are commonly associated with gut health and inflammation. Other studies have reported that individuals with OCD often exhibit higher levels of systemic inflammation, further linking gut dysbiosis to the disorder.

Nutrition and Supplement Recommendations:

• Avoid ultra-processed food
  • Most individuals don’t have the benefit of living off the land to make our own bread, yogurt etc. These products are considered processed but very minimally processed, and are fine to include in a whole foods diet. Ultra-processed foods have been significantly changed from their original state including breakfast cereals, plant milks, packaged soups, processed vegan products, chips and soda.
• Avoid Added Sugars
• Eat a high fiber diet
  • Aim for 25-35g per day
• Consume a whole foods, plant-rich diet with a wide variety of colorful herbs, fruits, vegetables, lean protein and beneficial fats from avocado, olives, nuts/seeds
• When Bacteroides is low, consumption of Tart Cherry Juice 8 ounces has shown to increase Bacteroides and decrease firmicutes – I recommend a lower dose 4 ounces over 15 days
• Add L-glutamine powder to reduce firmicutes to bacteroidetes ratio – I recommend 3g/day mixed with water or added to a smoothie
• Take a broad spectrum probiotic with lacrobacillus and bifidobacterium – I recommend Therbiotic Complete by Klaire Labs and take 2/day, keep refrigerated.

Conclusion

The relationship between the gut microbiome and mental health, particularly in the context of Obsessive-Compulsive Disorder, provides hope to individuals (and clinicians) by shedding light on the complex mechanisms by which the gut microbiota may influence brain function and OCD symptoms. Research is continually evolving, to open up new therapeutic avenues for OCD patients who do not respond well to conventional treatments. Getting to the root cause has always been our objective and we can help with dietary guidance, supplement recommendations and comprehensive stool testing. Consider scheduling an appointment today to get started.

References

Bendriss, G., MacDonald, R., & McVeigh, C. (2023). Microbial Reprogramming in Obsessive-Compulsive Disorders: A Review of Gut-Brain Communication and Emerging Evidence. International journal of molecular sciences, 24(15), 11978. https://doi.org/10.3390/ijms241511978

de Souza, A. Z., Zambom, A. Z., Abboud, K. Y., Reis, S. K., Tannihão, F., Guadagnini, D., Saad, M. J., & Prada, P. O. (2015). Oral supplementation with L-glutamine alters gut microbiota of obese and overweight adults: A pilot study. Nutrition (Burbank, Los Angeles County, Calif.), 31(6), 884–889. https://doi.org/10.1016/j.nut.2015.01.004

Hillman, A. R., & Chrismas, B. C. R. (2021). Thirty Days of Montmorency Tart Cherry Supplementation Has No Effect on Gut Microbiome Composition, Inflammation, or Glycemic Control in Healthy Adults. Frontiers in nutrition, 8, 733057. https://doi.org/10.3389/fnut.2021.733057

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