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Children on the autism spectrum are more likely to have a restricted diet, refusing more foods and eating a more limited food repertoire than their typically developing peers [4–6].
Many autistic people struggle with interoception. This means that they have a difficult time feeling and interpreting their body's signals. This connects with disordered eating behavior because it means they may miss their body's cues that they are hungry or full.
Research also tells us that many individuals with autism tend to have strong preferences for carbohydrates and processed foods, while rejecting fruits and vegetables. This, too, may reflect an aversion to strong tastes and textures.
Autistic individuals may have highly selective eating requirements or be particularly sensitive to the textures, look, smell or sound of foods, which can lead to food aversions. The social aspects of eating (such as sitting at a table with others, waiting until others are finished) can also be challenging.
Atypical eating behaviours have been recognised as common in autism. Such food behaviours can include very limited food preferences, hypersensitivity to food textures or temperatures, and pocketing food without swallowing.
Types of feeding problems associated with autism
The feeding concern most commonly observed in children with autism is food selectivity, or eating a limited variety of foods. This most often involves preference for starches and snack foods and more frequent rejection of fruits and vegetables.
Causes of overeating in autistic children and teenagers include habits, obsessions, unpredictable mealtimes, sensory sensitivities and emotions. It can help to keep snack foods out of reach or sight, replace snacks with other activities, and aim for predictable meals.
Many autistic people experience hypersensitivity to bright lights or certain light wavelengths (e.g., LED or fluorescent lights). Certain sounds, smells, textures and tastes can also be overwhelming. This can result in sensory avoidance – trying to get away from stimuli that most people can easily tune out.
Kids with autism can be extremely selective when it comes to eating. An estimated 46–89% of children with autism spectrum disorder (ASD) have feeding problems. ASD children struggle with sensory defensiveness, a need for routine and sameness, and visual overstimulation which makes expanding the palate difficult.
Another study found that children with autism are up to 41% more likely to develop obesity. Of these children, those at the highest risk are girls, nonwhite children, and older children. Within the study, the prevalence of obesity was 22.2%.
Eating together with other people is a common activity to socialize and feel a sense of belonging. But autistic adults often prefer to eat alone, though they have a desire to socialize.
People with autism may get easily attached to people, leading them to become over-friendly. It can be difficult to understand other people's perceptions of situations, therefore what they feel is appropriate, may be considered as socially unacceptable.
People with autism can experience extreme emotions. They may seem to overreact to certain situations or under-react in others. When something unpredictable occurs, it can be hard for an autistic person to keep their emotions in check.
7 foods to potentially avoid with autism
Sugar: Since children with autism may show signs of hyperactivity, it may be best to avoid sugar to maintain balanced sugar levels. Monosodium glutamate (MSG): Similar to sugar, MSG can cause overstimulation in the brain, leading to hyperactivity.
People with autism spectrum disorder are sometimes said to lack empathy (the ability to feel along with others) and/or sympathy (the ability to feel for others). While this stereotype is often used to describe all people with autism, these challenges are not experienced by everyone on the spectrum.
Autistic children commonly avoid social touch more than non-autistic peers. It is generally thought that this is due to autistic individuals experiencing hyper- or hyposensitivity of touch.
In children and teenagers with high-functioning autism, this can present as a limited social circle, difficulty completing group work, or problems sharing toys and materials. Many people with ASD have sensory difficulties. Certain tastes, noises, smells, or feelings can be intolerable.
Many adults on the spectrum struggle with food and cooking because of sensory stimuli, extreme sensitivity to change, and a strong preference for a narrow selection of ingredients. Research shows that individuals with autism tend to favor processed foods and carbohydrates.
Hoarding and self-injurious behaviors are relatively common in autism, but knowledge about their expressions in adulthood is scarce.
It's something you're born with. Signs of autism might be noticed when you're very young, or not until you're older. If you're autistic, you're autistic your whole life. Autism is not a medical condition with treatments or a "cure".
If you or a loved one has ASD, paying close attention to the foods being consumed is particularly important. For our patients with autism, we often recommend an elimination diet—eliminating gluten, dairy, sugar, corn, soy, and other categories of potentially allergenic foods for one month.
It's not uncommon for individuals with ADHD and autism to prefer to eat the same food—multiple times a day sometimes—for extended periods. Why? Because it works! And we usually find some comfort in it, which is why many neurodiverse individuals call them their 'safe foods'.
Though autistic people may respond to emotions and social cues differently than neurotypical people, this does not mean they lack empathy. Just like neurotypical people, levels of empathy vary between autistic individuals.