Autism, Interoception and Safe Foods

Research increasingly shows that autistic people experience differences in interoception – the internal sensory system that helps us notice and interpret body signals such as hunger, thirst, temperature, pain and the need to use the toilet. These interoceptive differences are closely linked with alexithymia (difficulty identifying and describing internal emotional states) and with challenges in self-regulation.

For autistic children, teens and adults, interoceptive signals are muted, delayed or confusing. They often don’t recognise that they’re:

●      starving or parched, until it’s extreme

●      overheated or too cold

●      need to use the toilet until it is urgent

●      in pain or unwell until symptoms are severe

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These interoception differences have major implications for safety, autonomy and emotional regulation:

●      Safety: reduced awareness of temperature, pain or illness can delay help-seeking and increase risk of injury or medical issues.

●      Autonomy: difficulty reading body cues makes it harder to independently manage eating, drinking, toileting, sleep and health.

●      Self-regulation: if a person does not notice early, mild cues (e.g. “I’m hungry” or “I’m overheating”), their first conscious awareness may be a state of intense discomfort or distress. At that point, behaviour can escalate very quickly.

Many autistic people say that they don’t notice “getting” hungry. Instead, hunger registers suddenly as urgent, often overwhelming and is experienced as a state that must be corrected immediately. “Sudden hunger” results in a demand for a specific safe food.

At the same time, autistic people commonly have sensory-based food preferences. Because taste, texture, smell and appearance can be intensely experienced, they may rely on very familiar foods that are predictable and feel “safe” to their nervous system.  This often include fast-food  like McDonalds, that are very consistent in flavour and texture.

When urgent hunger and the need for a familiar safe food occur together, several things can happen:

●      the person usually insists on one particular food or brand.

●      If that’s not available, distress will escalate rapidly.

●      This escalation can quickly progress from agitation to aggressive behaviour or a full autistic meltdown, especially if the person is already overloaded, anxious or fatigued.

Providing an autistic person with a familiar, safe food at the early signs of agitation can support regulation via several pathways:

1. Physiological stabilisation

   • Eating restores blood glucose levels and provides a predictable energy source to the brain. Sudden drops in blood glucose are associated with irritability, reduced concentration and heightened stress responses; stabilising glucose will improve mood and cognitive control.

   • When food includes a balance of carbohydrates and protein, it supplies amino acids (like tryptophan and tyrosine) required for the production of key neurotransmitters involved in mood and arousal, including serotonin, dopamine and norepinephrine.

   • Regular, adequately spaced meals and snacks support more stable stress-hormone patterns and can reduce the physiological load of chronic stress, however many autistic individuals don’t recognise they’re hungry until they’re “starving”.

2. Sensory and emotional safety

   • A predictable, well-known food means there are no sensory surprises. The taste, texture, smell and temperature arrive exactly as the brain expects, which reduces sensory threat and uncertainty.

   • This sensory predictability can create a sense of comfort and control, particularly in environments that feel chaotic, noisy or unpredictable.

   • The act of eating a safe food can become a learned calming strategy, associated with relief and soothing. Children and teens can’t verbalise this, they just know that the “known food” regulates them.

3. Support for self-regulation

   • Once urgent hunger is addressed and the nervous system receives both physiological fuel and sensory comfort, the person is able to access their existing coping strategies (communication, problem-solving, flexibility, transition skills).

   • Caregivers and support staff can then more effectively use co-regulation strategies such as calm presence, reduced demands, clear language and predictable routines.

For those of us supporting autistic people this has several practical implications:

●      Proactive support: build regular, predictable eating and drinking routines, rather than waiting for the person to say they are hungry or thirsty.

●      Interoception education: use visuals, stories and body-mapping activities to help the person learn to notice early body cues (e.g. “tummy rumbling”, “dry mouth”, “headache when I’m hungry”).

●      Safe foods as a planned tool, not a failure: identify a small range of acceptable safe foods and include them in behaviour support and regulation plans, especially for outings, after school/work and during periods of increased stress.

●      Whole-person view: while it is important to work towards dietary variety and nutritional adequacy, in acute situations the priority should be regulation and safety. Meeting interoceptive needs promptly can prevent escalation and reduce the frequency and intensity of meltdowns.

©NelleFrances 2023