Francesca Solmi, Ph.D., discusses the intricate link between autism and eating disorders. She outlines common eating disorders, noting their overlapping symptoms and similarities to autism traits. The speaker explores potential mechanisms for the connection between eating disorders and autism, including communication difficulties, sensory sensitivities, and emotion regulation. Solmi emphasizes Avoidant/Restrictive Food Intake Disorder (ARFID) and its relevance to autism, underscoring the need for more research and services for this often overlooked condition. The presenter considers future research directions before the Q&A.  

Handouts are online HERE

In this webinar:

1:30 – Common eating disorders
8:00 – Autism and eating disorders
11:00 – Trajectories of autistic traits and eating disorders
20:00 – Potential linking mechanisms
28:00 – Emotion regulation
34:50 – Avoidant/Restrictive Food Intake Disorder (ARFID) and Autism
40:00 – Future research
42:00 – Q&A

Overview of Eating Disorders 

Solmi defines eating disorders as severe psychiatric conditions that typically emerge in early to mid-adolescence. She describes common eating conditions, including Anorexia Nervosa, Bulimia Nervosa, Binge Eating Disorder, and OSFED (Other Specified Feeding or Eating Disorder), highlighting the significant symptom overlaps across conditions (1:35).

• Anorexia Nervosa – frequently the youngest age of onset. Characterized by an intense fear of weight gain, extreme dietary restriction, and often low body weight. Some individuals may also engage in bingeing and purging.
• Bulimia Nervosa – slightly later onset and involves episodes of binging followed by compensatory behaviors like self-induced vomiting or excessive exercise.
• Binge Eating Disorder – the most recently recognized diagnosis. It involves bingeing without compensatory behaviors, often accompanied by feelings of shame or guilt.
• OSFED (Other Specified Feeding and Eating Disorder) is a residual category for individuals whose symptoms don’t fully meet the criteria for other diagnoses. 

The speaker emphasizes the severity of these conditions, noting their association with higher mortality rates (5:00). Despite this, eating disorders are often under-researched compared to other mental health disorders. She also notes their high prevalence in girls and women, suggesting underdiagnosis in men (6:30).  

The Link Between Autism and Eating Disorders 

Solmi discusses the connection between autism and eating disorders. A study by Westwood and colleagues revealed elevated autistic traits in people with anorexia nervosa. Similarly, people with autism and anorexia nervosa mentioned rigidity or rules, intense interests, difficulties recognizing hunger, and social difficulties (8:00). A significant challenge in this research, the presenter explains, is distinguishing between pre-existing autistic traits and those that may be mimicked by severe malnutrition in anorexia nervosa. 

Autism Spectrum Disorder in Anorexia Nervosa: An Updated Literature Review (Westwood et al., 2016)

Research on Autistic Traits and Disordered Eating Trajectories

Solmi presents findings from a study investigating whether autistic traits were present before the onset of disordered eating behaviors (11:00). Researchers found that children who later developed disordered eating behaviors exhibited higher levels of autistic traits at age seven, and these differences persisted throughout adolescence. The speaker asserts that these findings suggest autistic traits may precede the onset of disordered eating (17:00). The study also revealed that more severe eating disorder symptoms correlated with higher autistic trait scores from age seven onwards, indicating a strong association with more severe presentations of eating disorders.

Trajectories of autistic social traits in childhood and adolescence and disordered eating behaviours at age 14 years: A UK general population cohort study (Solmi et al., 2020)

Potential Mechanisms Linking Autism and Eating Disorders 

The presenter explores several mechanisms as potential links between autism and eating disorders. For example, as friendships become more important in adolescence, struggles with social interaction can exacerbate mental health difficulties, with eating disorders potentially serving as a coping mechanism. Children with social communication difficulties may also be more susceptible to bullying, which can lead to internalized weight-stigmatizing thoughts and behaviors like dieting (20:00). Young people with autism often exhibit more sedentary behaviors compared to their peers, which can increase BMI and vulnerability to weight-based stigmas (23:00). 

Emotion regulation difficulties are also common in both autism and eating disorders. Solmi outlines a recent study showing that individuals who later developed anorexia nervosa symptoms exhibited less improvement in emotion regulation skills from early to mid-childhood compared to their peers, where differences emerged around age five (30:00). Further, in girls, social cognition explained around half of the association between emotion regulation difficulties and disordered eating. The association in boys was less clear, likely due to smaller sample sizes (35:00).

The presenter notes that sensory sensitivities, a core aspect of avoidant/restrictive food intake disorder (ARFID), are frequently reported by people with anorexia nervosa. For example, in a qualitative study on autism and anorexia in women, emerging themes included difficulty with sensory sensitivities, social interactions and relationships, and challenges with emotions (33:00). 

A mixed-methods approach to conceptualizing friendships in anorexia nervosa (Datta et al., 2021)

Autism Spectrum Disorder and Obesity in Children: A Systematic Review and Meta-Analysis (Sammels et al., 2022)

Emotional dysregulation in childhood and disordered eating and self-harm in adolescence: prospective associations and mediating pathways (Warne et al., 2022)

“For Me, the Anorexia is Just a Symptom, and the Cause is the Autism”: Investigating Restrictive Eating Disorders in Autistic Women (Brede et al., 2020)

Avoidant/Restrictive Food Intake Disorder (ARFID) and Autism

Solmi discusses ARFID, a disorder now included in the eating and feeding disorder family, noting its relevance to autism. Its three main aspects include limited interest in food, sensory sensitivities (e.g., avoiding specific foods due to texture), and concerns about adverse consequences from eating (34:50). The speaker emphasizes the limited epidemiological research on ARFID, the lack of services (especially for people who are not severely underweight), and the need for more studies to understand its prevalence, risk factors, and effective treatments (37:00).

Future Research Directions 

According to the presenter, future research should aim to understand the complex links between autism and eating disorders more comprehensively. Key areas of investigation include the connections between sensory sensitivities and ARFID, gender differences in the association of autistic traits and eating disorders, links between other autistic traits and different eating disorder presentations, physiological factors like the gut-brain response, and age of autism diagnosis in those with and without eating disorders. These avenues of research, Solmi asserts, will improve diagnostic tools and help to develop better prevention and care strategies (40:00). The speaker summarizes main points before the Q&A (42:20). 

This is a joint presentation by ARI and the World Autism Organisation.

Professor Carmelo Rizzo, MD, discusses adverse reactions to food and the critical role of intestinal microbiota in autism. He outlines the history of clinical nutrition and highlights the role of chronic inflammation in disease pathology. The presenter considers the interplay of inflammation, altered gut absorption, and food intolerances, underscoring the high occurrence of GI issues in autism and their correlation to behavioral characteristics. Rizzo discusses implications for clinical practice before the Q&A. 

This is a joint presentation by ARI and the World Autism Organisation.

Handouts are available HERE

In this webinar: 

0:00 – WOA & ARI introduction
6:10 – Speaker background and introduction
9:30 – Total load effect
12:30 – Clinical nutrition
15:44 – Food adverse reactions & inflammation
19:45 – Stress response theory
23:00 – Food intolerance vs. food allergy
24:50 – Altered gut absorption
29:00 – Food intolerances
31:30 – The gut microbiome
34:50 – Microbiota and autism
40:28 – Clinical implications
41:45 – Q&A

Introduction

Rizzo explains the total load effect as the idea that our overall health depends on numerous factors, including genetics, emotional and physical environments, inhalants, electromagnetic fields, and nutrition, to name a few (9:30). He highlights nutrition as a critical aspect of prevention and care for many conditions, citing research on the connection between food allergies, behavior, and diet from the early 20th century. Basic principles of clinical nutrition emphasize removing the toxin or chemical and repairing any chronic damage/inflammation, particularly to sensitive organs (12:30). The presenter notes pioneering researchers in ecology and how their work has impacted how contemporary researchers and practitioners understand complex neurological conditions (13:25). 

• Neuropathic manifestations in infants and children as a result of anaphylactic reaction to foods contained in their dietary (Shannon, 1922)
• Elimination Diets and Patient’s Allergies. A Handbook of Allergy (Rowe, 1944)

Food adverse reactions & inflammation

Food adverse reactions include allergies, pseudoallergies, hypersensitivity, toxic reactions, and food intolerances, all of which can lead to inflammation  (15:44). Rizzo describes how inflammation keeps us alive by destroying bacteria and viruses but how it can cause intense injury to organs and tissues if not addressed. Inflammation occurs differently in each person and can manifest in multiple ways simultaneously. Common external presentations of inflammation include osteoarthritis, sore throat, eczema, rhinitis, migraines, and multiple sclerosis (17:30). The presenter notes the connection between inflammation and depression, cancer, obesity, Alzheimer’s, and heart disease, underscoring the importance of correctly identifying and addressing chronic inflammation (18:40). 

Rizzo defines stress as a non-specific response of the body to harmful stimuli (19:45). To illustrate immune system function under the stress theory, he uses the analogy of a barrel holding water (functioning). At first, it holds well based on its build (genetics) and age, but the barrel can only hold a certain amount of water (adapt to a certain point). If the water flow (environmental stressor) doesn’t stop, water begins to spill out of the barrel (physical manifestation/symptom). Those with a full barrel develop food or chemical imbalances that present as conditions or symptoms (20:40). The speaker describes complementary science, underscoring the ability to identify what substances should be added or removed from the body based on specific indications (22:00). 

Altered gut absorption

The speaker highlights the importance of intestinal microbiota in the creation and absorption of crucial vitamins and nutrients, noting the specific balances required for proper immune function (24:50). He details the layers of the intestinal barrier and underscores the role of the mucosal immune system within the gut (26:25). Alterations to the intestinal barrier cause gut permeability, allowing macromolecules into the body where they may be recognized as foreign and activate the body’s defense mechanism. Anything from genetics to emotional stress can cause changes in the gut microbiome (27:45).

Food intolerances

Food intolerances are characterized by an inability to absorb or metabolize certain nutrients, causing an abnormal reaction to specific foods (23:00). Rizzo provides examples of biological food families and highlights their importance in addressing food intolerances. If ingestion of foods within the same family continues, he explains, the body won’t properly detox, and intolerance will persist (29:00). Food intolerances can manifest in any organ, and the reaction window is 72 hours, so what feels like a direct reaction to one food could be a buildup of inflammation in the body (30:10). Symptoms related to food intolerances occur in the central nervous system (headache, depression), genital-urinary systems (vaginal irritation, cyclic cysts), respiratory systems (nasal congestion, rhinitis), skeletal muscle (muscular cramps, articular cogency), gastrointestinal tract (nausea, IBS, Crohn’s disease), and skin (eczema, rash, facial paleness) (31:15).

The gut microbiome

The intestinal microbiota is composed of billions of cells and is one of the largest, most complex bacterial ecosystems on the planet (31:30). Rizzo discusses the development paths and general functions of the gut microbiota for infants, children, adults, and the elderly (32:30). The microbiome’s metabolic functions, such as vitamin production and amino acid synthesis, make it a critical factor in disease prevention and care (34:00).

Microbiota and autism

Individuals with autism have unique intestinal bacterial populations correlated with various autism traits. The presenter outlines a 2005 study on autism-related behaviors and GI experiences with more than 900 participants (34:50). The most common GI disturbances reported were constipation (48%), diarrhea (28%), abdominal pain (55%), and gastroesophageal reflux (10%), with an inflammatory index of 40% (37:20). Histological (tissue and cell structure) findings showed esophagitis, chronic gastritis, colitis, and eosinophilic gastritis (38:08). Participants were prescribed pharmacological and dietary interventions. 

At a twelve-month follow-up, 150 participants reported improvements in GI pain (64%), bowel complaints (84%), reflux (41%), muscle mass (40%), hyperactivity/aggression (65%), attention (34%), and sleep-wake rhythm (22.1%). Rizzo asserts that these findings indicate that anxiety, sensory-responsivity, and GI issues are interrelated phenomena for people with autism (38:50).

• Anxiety, Sensory Over-Responsivity, and Gastrointestinal Problems in Children with Autism Spectrum Disorders (Mazurek et al., 2013)

Implications for clinical practice

Outside of autism, the gut microbiome is central to the prevention and care of type two diabetes, cardiovascular diseases, liver disease, hyperlipidemia, and many other conditions (34:50). Understanding the integral role of the gut microbiome in systems across the body must be a priority for clinical research and practice (40:28). Rizzo concludes that the development of the microbiota field must involve cardiologists, allergists, psychiatrists, and other specialists concerned with pathological conditions (40:43). He provides thanks before the Q&A session where he discusses chronic inflammation, biological food groups, and much more (41:45)

Dr. Calliope Holingue, MPH, Ph.D., provides an overview of the intersection between the gut, autism, and well-being. She outlines recent studies on the GI needs and experiences of autistic individuals and discusses the complex pathways of connection between the gut and autism. The presenter summarizes GI-autism research to date, highlighting the need for screening tools specific to autistic GI experiences. Diet change and Fecal Matter Transplant are outlined as microbial interventions in autism. Holingue provides tips for recognizing GI distress and discusses future directions for research and interventions before the Q&A. 

In this webinar:

1:00 – Outline
1:50 – Autism and gastrointestinal issues
4:15 – Common GI symptoms
6:20 – Study: Qualitative study of families with autistic children with GI issues
12:00 – Study: GI experiences and needs of autistic adults
16:20 – Linking GI symptoms and autism
21:04 – Intersection of autism and GI research
25:55 – Microbiome interventions in autism
32:10 – Fecal matter transplant (FMT)
34:00 – Study: Autism and microbiota transfer therapy
39:55 – Recognizing GI distress in autism
43:05 – Quotes from parents
44:24 – Gastrointestinal and related behaviors inventory (GIRBI)
45:50 – Future directions
47:45 – Q&A

Autism and gastrointestinal issues

Holingue outlines common clinical characteristics of autism and explains how co-occurring medical conditions affect autism heterogeneity (1:50). People with autism often have complex healthcare needs but consistently experience a lower quality of care and assistance across their lifetime (3:05). The speaker explains that gastrointestinal (GI) issues like constipation, diarrhea, and abdominal pain are incredibly common in autism, occurring in 47% of autistic participants in a recent meta-analysis (4:15). She notes that GI distress has been linked to co-occurring conditions like seizures, sleep disorders, and functional behavior difficulties (5:30). 

Study: Qualitative assessment of GI issues in autistic children and their families

The speaker outlines her 2022 publication in Autism, assessing the experiences of autistic children with GI issues and their families. Researchers derived four main themes from 12 parent interviews (6:20). First, autistic children often have difficulty verbally communicating the presence of GI symptoms, and second, GI issues impact a child’s overall well-being and ability to fully engage in activities like school or social gatherings (7:40).

The third theme to emerge was how GI issues impact the family’s well-being due to parental frustrations, financial stressors, and limitations on family activities (9:00). Finally, theme four highlights the challenges parents experience with finding accessible quality care for their children. Many noted lengthy, complicated processes, medical offices not conducive to autism, and a lack of education and experience in healthcare providers (10:12). 

Study: GI experiences and needs for adults with autism

Holingue outlines a study exploring the GI experiences of autistic adults (in preparation for publication). The study aims to investigate the needs and priorities of autistic adults and develop recommendations for research and support (12:00). Similar to the first study, participants said that GI symptoms profoundly impact their ability to create relationships, work, and live comfortably (overall well-being). They also described common triggers for GI issues, including stress, sensory overwhelm, and changes in routine, and highlighted frustrating and unhelpful experiences with the healthcare systems (13:15). To improve GI health in autistic adults, the researchers recommend more training around interoception, anxiety, and advocacy for adults with autism. Similarly, they assert the need for increased healthcare provider training on assessing and treating complex health issues and autism accommodations (15:15). 

The intersection of autism and GI issues

Pathways of connection

Holingue claims that pathways linking autism and GI issues are complex. For example, common co-occurring conditions, like anxiety, sleep problems, and restrictive diets, drastically alter the gut microbiome (16:20). Similarly, GI symptoms can exacerbate irritability, anxiety, and other behaviors related to pain or discomfort (19:00). The presenter touches on biological pathways that interact with GI health including the microbiome, vagus nerve, immune system modulation, gut permeability, and serotonin production (20:14). She explains that maternal microbiomes interact with fetal immune systems and how early life exposures shape the development of the microbiome (i.e., delivery mode, diet/breastfeeding) (29:00). 

History of GI-autism research

The speaker outlines autism-GI research starting from the early 2000s. She briefly summarizes initial observations (21:04), the discovery of the gut-brain axis (22:15), how microbiome diversity can inform behavior and treatment (22:40), and the beginning of intervention studies (23:35). Contemporary research, Holingue continues, focuses on understanding the mechanisms by which the gut microbiome influences the brain and how the environment influences the composition of the gut microbiome (24:30). 

Microbiome interventions in autism

Microbial interventions hold promise in autism because they are modifiable for individuals across heterogeneities. The speaker notes that most studies to date are strictly pediatric (25:55). Findings across the field are divergent and inconclusive due to small cohorts, different comparison groups, and autism heterogeneity (26:30). The presenter asserts that failure to control for potential confounders, or other things that could impact the microbiome (i.e., diet, antibiotics, medications, etc.) is a major limiting factor across studies. 

Diet change is a common intervention that affects gut microbial composition (30:50). Holingue describes fecal matter transplant (FMT), where a healthy donor provides feces (after extensive screening and safety measures), which contains microbiota needed by someone with a specific health condition. The cleaned microbiota is delivered to the recipient via pill, drink, or endoscopy (32:10). She discusses the difference between intestinal mucosa (fecal matter) and the microbiome, noting the safety and ethical nuances associated with FMT (28:00). 

Study: Autism and microbiota transfer therapy

Holingue outlines an FMT study by Kange et al. (2019) in which parents collected stool samples and recorded symptoms during treatment (35:12). Microbiome results showed that autism gut bacteria were less diverse at baseline but increased throughout the treatment, ending with a similar composition to controls. Some long-term effects were recorded (35:20). There was a significant correlation between changes in GI composition and autism behaviors, meaning that as GI symptoms improved, associated behaviors decreased. The treatment was generally well tolerated, with few temporary adverse effects (36:16). The speaker discusses study limitations, including a lack of a placebo group and randomization (37:20). She considers the difficulty and importance of disentangling treatment effects from other drivers and notes the small sample size in this study (38:10). 

Recognizing and treating GI issues in autism

The presenter briefly discusses symptoms and signs of GI distress in autism (39:55). She underscores that children, in general, have difficulty communicating pain and that this is often exacerbated in children with neurodevelopmental conditions (41:00). Holingue discusses a recent analysis that found that symptom estimates vary according to how they are measured (i.e., parents/practitioners/complex data) and that existing measurements were not developed for the autistic population (41:44). 

Parents are often relied on to detect GI problems in their children. The presenter lists some tell-tale signs of GI distress in autistic children and asserts the need for assessment tools specific to GI experiences in autism (42:35). She outlines the Gastrointestinal and Related Behaviors Inventory (GIRBI), which assesses symptoms, bowel movements, and other behaviors potentially related to GI issues (44:24).  Results from the pilot GIRBI questionnaire show high convergent validity, high sensitivity in predicting parent-report diagnosis, and a 7-factor solution to recognizing GI issues in autism (45:40). 

Future directions

The speaker asserts that future work on GI measurements should include multiple versions of the GIRBI, with specific attention given to adults and older adults with autism. Future assessments should also incorporate biospecimens with report measures and include self-reports, caregiver reports, and more clinical evaluations (45:50). Holingue provides thanks and acknowledgments (47:12) before the Q&A, where she discusses food allergies, gluten vs. celiac, recommended diets, advocacy in medical settings, and how modes of delivery impact an infant’s gut (47:45).

Kelly Barnhill, MBA, CN, CCN, summarizes emerging research on nutritional approaches and supports for autistic people. She outlines recent investigations on sensory processing and nutrition, dietary changes, and supplementation. The speaker discusses recent systematic reviews, highlighting general consensus and gaps in research. Barnhill describes several ongoing studies and future avenues of investigation before the Q&A session.

In this webinar: 

1:30 – Goals and objectives
2:45 – Critical aspects of current discourse
5:28 – Sensory processing and diet
9:15 – Dietary changes
13:40 – Dietary supplements
14:30 – Systematic reviews and meta-analyses
19:00 – Significant findings from the last year
22:00 – Ongoing and future research
29:03 – Q&A

Current discourse and recent publications

Barnhill outlines presentation goals and objectives and highlights the challenges faced by researchers during the COVID-19 pandemic before diving into research updates (1:30).

She summarizes a study that found that 43 autistic participants had significantly higher histamine and lower thiamine than non-austic controls. The speaker asserts that these findings suggest the need for further research into potential interventions and screenings that target these biomarkers (2:45). A study on the impact of dietary quality on executive function found a correlation between poor dietary quality (high intake of processed carbohydrates) and impaired working memory, executive function, and organizational skills (3:58). Barnhill states that dietary factors impact development trajectories and that improving diet quality can improve educational outcomes (4:25). 

Sensory processing and nutrition

The presenter summarizes a study that found autistic children exhibit higher sensory sensitivity to food than their non-autistic peers. Study data also showed lower levels of calcium and vitamin D in the autistic group compared to non-autistic controls. These findings, she continues, reinforce the clinical perspective of food sensitivity in autism, which also emphasizes the impact these sensitivities have on food choices and eating aversions (5:28).

Barnhill cites a study that revealed family units of individuals with food sensitivities also present with different eating profiles (6:00). Another sensory study on BMI found that almost 60% of participants met units for being overweight, and 12% met criteria for thinness or failure to thrive (7:00). These and other studies show autistic children have different eating and feeding styles than non-autistic controls. Barnhill notes that a lot of work is being done to profile how autistic children participate in feeding environments, what their preferences may look like, and appropriate interventions (8:00). 

Dietary changes and supplements

Barnhill explains that a growing body of evidence supports dietary changes and vitamin supplementation in autism. A study involving 400 males and 130 females across multiple facilities in the UK tracked nutrition and development over time. Results showed that adopting a ketogenic diet, with professional support, can be a feasible and appropriate intervention for autistic children (9:15). The speaker cites a survey study that revealed no significant differences in routine while starting a ketogenic diet and that it is easy to assist children in starting the diet if necessary (11:00). Barnhill suggests screening for autism in children who present with significant feeding disorders. 

The speaker describes two animal model studies examining the effect of ketogenic diets on mouse behavior. The first study found that mice on ketogenic diets had reduced social and cognitive deficits and repetitive behaviors and an increased abundance of beneficial microbes in the gut, with no adverse side effects reported. A second study found similar results and also indicated that ketogenic diets may restore histone balances in affected mice (12:15). A third mouse model that tested zinc supplementation saw improvements in social interaction and fear but had no effect on social novelty, or the initiation of new circumstances (13:40).

Systematic reviews and meta-analyses

Barnhill presents a review that found low choline and B vitamins and abnormal amino acids in autistic children compared to non-autistic groups (14:50). Another review on probiotic supplementation found evidence that dietary change can increase oxidative stress. The presenter suggests monitoring oxidative stress as a mark of microbiome changes in the future (16:05). Clinical literature reviews assert that autistic individuals are often deficient in vitamins A, C, B6, and B12. Across reviews of gluten-free/casein-free (GF/CF) diets, there is consensus that GF/CF diets are quite feasible and carry few adverse effects (17:03). Barnhill highlights a review of dietary interventions by Amadi et al. as an excellent source for big picture concepts and detailed questions (18:23). 

The speaker highlights significant studies from the last year that looked at nutrients/probiotics as anti-inflammatories/modulators (19:00), prenatal diets as a modifier for environmental risk factors for autistic traits (19:50), and assessment and data collection methods across studies (20:35). She explains that to best represent typical dietary intake, three-day real-time collection across weekdays and weekends is needed (21:22). 

Ongoing and future research

Barnhill outlines an ongoing study in Florida that explores the impact of eating program interventions (22:25). She also highlights an ongoing longitudinal study assessing the effect of therapeutic GF/CF diet and physiotherapy on the gross motor and cognition of autistic children (23:18). Enrollment is currently open for another exciting study that looks at using folic acid to promote language development (24:01). Finally, the first large study on the impact of mitochondrial function and nutrient intervention is also currently being conducted (25:31). These studies, the speaker asserts, represent a continuous efforts to advance our understanding of autism and identify targeted interventions. 

Barnhill considers future avenues of research and underscores that the most significant barrier to nutritional research is a lack of funding. Contemporary research, she continues, should focus on targeted dietary intakes and anti-inflammatory factors. While GF/CF diets are feasible and effective, she warns against having tunnel vision and reminds viewers that we must always consider more than one avenue (26:30). 

Q & A

During the Q&A (29:03), Barnhill discusses picky eating and nutrition in adulthood (31:40), feeding therapy and dietary changes (36:00), paleo diets and multivitamins (38:00), and Celiac and autoimmune diseases in autism (44:50). She also considers good sources for protein (51:45), vitamins (55:15), and multivitamins (57:05).

This is a joint presentation by the World Autism Organisation and ARI.

Frederico Balzola, MD, discusses the intersection of chronic inflammation, gastrointestinal issues, and autism. He considers intestinal permeability and how the microbiome interacts with the central nervous system to affect inflammation in the body. The speaker provides historical context for increased autoimmune and inflammatory diseases and highlights the relationship between GI discomfort/pain and behavioral outcomes. Balzola presents a longitudinal study on inflammatory disease pathogenesis and considers what the results mean for autism medical care moving forward. He summarizes the presentation and critical conclusions before the Q&A. 

In this webinar: 

4:00 – Disease origin and the gut
8:00 – Intestinal permeability
11:30 – Zonulin and the tight junction
15:40 – Societal changes and the gut
18:10 – Food systems, diet, hygiene, and antibiotics
25:00 – The microbiome and immune responses
30:15 – Fecal Microbiota Transfer therapy
34:00 – Gut inflammation in autism
37:15 – Behaviors and GI discomfort
42:00 – Longitudinal study on GI inflammation in autism
48:40 – Results and interpretation
50:15 – Environmental risks
54:55 – Summary and conclusion
1:02:11 – Q&A

Intestinal permeability

Balzola describes how the prevalence of autoimmune and inflammatory diseases has drastically increased over the last four decades. He asserts that this observation reaffirms Hippocrates’s theory that all diseases begin in the gut (4:00). Dr. Alessio Fasano said (5:50), 

“The bowel is a battlefield where enemy and friends negotiate molecular trafficking leading to either tolerance or immune response. It is the largest interface between our body and the outside world.” 

The speaker discusses the role of intestinal permeability in immune system function and how increased permeability can lead to chronic inflammation and allergies (8:00). Balzola outlines the structure of the gut lining and details the evolutionary history of the Tight Junction – a group of 150 proteins that regulate the paracellular trafficking pathway from the bowel to the blood vessels (11:30). Zonulin, the first component of the Tight Junction, appeared in humans 2 million years ago, and was a critical step in evolution as it allowed for regulation across the intestinal lining. The Zonulin gene is on chromosome 16 and has been implicated in diabetes, obesity, and several autoimmune diseases (13:50). 

Societal changes and the gut

Balzola explains how drastic societal and environmental shifts over the last five decades have driven the increase in autoimmune and inflammatory diseases (15:40). He highlights changes in food systems and processing (18:10), diet and meal size (20:55), hygiene and bacterial exposure (22:35), and antibiotic use (24:05). Each of these changes directly impacts the composition of the microbiome and, therefore, the intestinal lining. Contemporary research shows the capacity of the microbiome to influence immune responses and its implication in liver disease, diabetes, autism, Ankylosing Spondylitis, and other inflammatory and autoimmune diseases (28:00). Researchers have also found specific imbalances in the gut that can upregulate Zonulin release, further suggesting that Zonulin is a trigger for inflammation due to its role in intestinal permeability (29:40). 

Gastrointestinal issues in autism

The presenter describes differences in microbiota patterns between autistic and non-autistic individuals (30:15). He touches on fecal microbiota transfer therapy (FMT) and its potential as an effective treatment for gut microbial imbalances in autism and other chronic diseases (31:35). Signs of gut inflammation can be challenging to spot in autistic individuals due to differences in communication and sensory perceptions (34:00). Balzola notes that many autistic people have elevated pain thresholds and difficulties with verbal communication, underscoring the association between behavior and pain expression in autism (36:15). Behaviors commonly associated with gastrointestinal (GI) stress in autism include acid reflux, sleep disturbances, and self-injurious behaviors. The speaker describes possible sitting positions that may help to reduce stomach pain, and illustrates differences in school work outcomes according to levels of pain and inflammation (37:15). 

Balzola outlines a longitudinal study with 1650 participants, where 339 autistic individuals had significant GI symptoms. He presents study participants’ initial family history and GI symptom information, noting that 46% had macroscopic malabsorption and 88% had behavioral disturbances after GI symptoms developed (42:00). GI lab examinations for the study included esophagus, stomach, colon, and rectum (44:30). One participant with inflammatory bowel disease and chronic excess of eosinophils (white blood cells) was treated with the FODMAP (fermentable oligosaccharides, disaccharides, monosaccharides, and polyols) diet. Results showed a reduction in constipation, abdominal pain, proctalgia, and tenesmus, as well as improvements in hyperactivity, motor skills, and mental attention (48:40). At the one-year follow-up, all symptoms were reduced. Researchers, therefore, conclude that there is a significant association between clinical manifestations and histological alterations, meaning that inflammation induces gastrointestinal diseases and their subsequent behaviors (49:21). 

Review and conclusion

The speaker notes that the first 1000 days of life are crucial for clinical inflammatory disease and urges pediatricians to consider this. Environmental risks from pre-conception to postnatal impact inflammatory disease pathogenesis (50:15). He presents a case scenario for cumulative environmental risks, highlighting that the gut microbiome is the result of the sum of every risk and, as such, is very fragile at the beginning (52:30). He summarizes critical points from the presentation and how they translate to changes in perspective and care. Specifically, he urges viewers to consider autism as a multiorgan inflammatory disease and to assume the central nervous system plays a role in intestinal inflammation. He reminds viewers to consider pain thresholds in autistic patients with GI symptoms and to listen to the opinions and experiences of parents to gain a better understanding of autism complexities. Balzola also asserts the need for longitudinal approaches to investigation and medical care to predict and adequately address inflammatory or degenerative diseases (54:55). Most importantly, he continues, it is imperative that evolving information about inflammation in autism is transferred from research to the bedside (1:00:00). He notes Schopenhauer’s three stages of truth before opening to questions (1:01:22).