Living with celiac disease doesn’t just affect your gut – it can impact your mental health too.
A growing body of literature suggests that people living with celiac disease may be more likely to be diagnosed with mental health and neurodevelopmental conditions like depression, anxiety, mood disorders, eating disorders, autism, and attention deficit hyperactivity disorder (ADHD), compared to the general population (1–4). Of the conditions associated with celiac disease, anxiety and depression have been the most studied, with studies finding a higher prevalence of people presenting with symptoms or being diagnosed with anxiety and depression (4–8).
What might explain the link between celiac disease and mental health?
The higher prevalence of mental health conditions among people who live with celiac disease remains unclear; however, researchers have proposed several theories.
Inflammation and the gut-brain connection. When people with celiac disease eat gluten, their immune system reacts, causing inflammation and damage to the small intestine. This can alter the permeability of the small intestine. Some studies suggest that the gluten protein fragments, known as immunogenic peptides, may leak through the intestinal walls, enter the bloodstream, and interfere with brain function (1).
Gut microbiota changes. Research on the brain-gut connection has suggested that the gut microbiota may have the ability to influence mood and behaviour, with some evidence noting that healthy gut microbiota may be protective against psychiatric disorders. Due to observed changes in gut microbiota among gastrointestinal conditions like celiac disease, it is plausible that this may contribute to the development psychiatric disorders in celiac disease (1).
The challenge of a strict, lifelong gluten-free diet. Of the theories proposed, research on the psychological impact of following a strict gluten-free diet has been well documented. Unlike most chronic conditions that are managed through medication, the only treatment for celiac disease is a strict, lifelong, gluten-free diet. Following a gluten-free diet can help to alleviate and manage the symptoms of celiac disease, prevent health complications, and may improve health-related quality of life in some patients; however, the treatment has been described as socially and emotionally challenging (1,9–11).
While it appears that most of the focus for newly diagnosed patients is on the gluten-free diet, physicians reported that patients appeared to be the least prepared to manage the emotional and mental health adjustments of a new diagnosis, highlighting the mental toll celiac disease and the gluten-free diet can have.
Collectively, these factors may contribute to the developmental of mental health conditions among individuals living with celiac disease.
New Study from Alberta Explores Psychiatric Medication Use
Little is known about the treatment for psychiatric conditions among the celiac disease population and how pharmacological treatments may change over time. In a recently published study from Alberta Canada (12), the authors aimed to characterize patterns in psychiatric medication use in individuals before and after receiving positive tTG serology. Specifically, the study looked at over 14,000 children and adults who tested positive for celiac autoimmunity between April 2015 to March 2023. Researchers examined administrative healthcare data to identify the dispensation of psychiatric medication before and after the celiac autoimmunity results. The authors specifically looked at three medication types commonly used for mental health conditions:
Antidepressants for depression
Anxiolytics for anxiety
Antipsychotics for conditions like psychosis
Key Findings from the Study
Psychiatric medication uses increased after testing positive for celiac disease serology (29.5% à8%)
After people were found to have celiac autoimmunity, the study found:
More dispensing of antidepressant medications (22.5% à6%)
More dispensing of antipsychotics medication (4.6% à0%)
BUT fewer dispensing for anti-anxiety medications (15.4% à4%)
These findings were found to be statistically significant, meaning they were unlikely to be due to chance.
2. People were more likely to start psychiatric medication after positive testing for celiac autoimmunity.
The study found that people had 1.22 times higher odds of being dispensed psychiatric medication after tTG testing.
These odds were higher among females (1.29 times higher odds) and those diagnosed before 25 years old (2.50 times higher odds). tTG levels at diagnosis were not found to be a significant modifier in medication dispensed.
3. For people who already had healthcare encounters for anxiety and depression, the odds for medication dispensed decreased. (45.1% à1%)
These odds were not modified by factors like sex and tTG levels at testing; however, the associations for age remained, with a decreased odds for those under 25 years old.
What the study didn’t cover
This study was not designed to show cause and effect. We cannot conclude that celiac autoimmunity causes mental health conditions such as depression, anxiety, or psychosis. It only demonstrates patterns in medication use before and after celiac autoimmunity results.
No information was collected on gluten-free diet adherence. Following the diet could influence mental health, but this was not measured.
Medication data is based on prescriptions filled, not necessarily medication taken. As the authors stated, this data does not tell us if people actually took the medication that was dispensed to them; however, repeated dispensing makes it more likely that people are taking their medication.
Why this matters for people with celiac disease
This study highlights that being diagnosed with celiac disease may be a vulnerable time, especially for young adults and women. While we can’t say for certain that celiac disease directly causes mental health conditions, we are mindful that the stress, dietary restrictions, and lifestyle changes can take a mental toll.
If you or someone you know is struggling with mental health after a diagnosis, know that you are not alone and support is available. Talking to a healthcare provider or mental health professional can be helpful in managing both the physical and emotional aspects of celiac disease.
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