Knowledge · Body signals

Interoception: how we perceive hunger, thirst and other body signals

Interoception refers to how the nervous system perceives, interprets and processes signals from inside the body – such as hunger, thirst, heartbeat, breathing, temperature, a full bladder or tension. Much of this happens unconsciously. Interoception is a perceptual process, not a diagnosis; research findings on autism and ADHD have so far been mixed.

The essentials

  • Interoception covers the perception of internal body signals such as hunger, thirst, heartbeat, temperature or the urge to urinate.
  • Researchers distinguish how accurately signals are detected in tests, how people rate their own perception and how well the two match.
  • Findings on autism and ADHD are mixed. A meta-analysis found no significant difference in heartbeat perception in autistic adults.
  • You can try fixed external anchors for eating, drinking and breaks without waiting for a clear body signal.

01

What interoception covers

Besides seeing, hearing or touch, there are perceptions that come from within. Khalsa and colleagues describe interoception as the ongoing representation of the body's internal state, both conscious and unconscious.

  1. Signals from inside the body

    These include hunger and fullness, thirst, heartbeat and breathing, warmth and cold, the urge to urinate, pain or the feeling of coming down with something. The National Autistic Society names exactly these kinds of internal states as part of sensory perception.

  2. Perceiving, interpreting, acting

    A signal can arrive and still be misread – for example, hunger as irritability. It can also be recognized correctly and still be put off because something else is holding your attention. For everyday life, it is useful to look at these stages separately.

  3. Three levels in research

    In 80 people, Garfinkel and colleagues distinguished between accuracy in a heartbeat test, self-assessment by questionnaire and awareness of how accurate one's own assessment is. The three levels were only partly related. Rating yourself highly does not automatically mean doing well in the test – and vice versa.

  4. A process, not a clinical finding

    Interoception describes how perception works, not an illness. Khalsa and colleagues note that there is so far little evidence that interoceptive measures predict diagnoses, course or treatment outcomes. A single test or questionnaire therefore says little about a person.

Current morning routine with individual steps
App screens with example data

02

Autism and ADHD: what the mixed research shows

Many studies are small, use different tests and often look only at heartbeat. The following findings show tendencies in groups, not a trait shared by all autistic people or everyone with ADHD.

  1. Autism: no consistent pattern

    A meta-analysis by Klein, Witthöft and Jungmann (2025) reviewed 31 studies. In five adult studies with 132 autistic and 134 non-autistic people, it found no significant difference in the accuracy of heartbeat perception. For children and adolescents, and for questionnaires, the results were contradictory.

  2. Self-assessment and test results can diverge

    In a small study by Garfinkel and colleagues (2016), autistic adults performed worse in a heartbeat test but rated their body awareness higher. Fiene and Brownlow, by contrast, found lower self-reported body and thirst awareness in 74 autistic adults. So the direction is not consistent.

  3. Alexithymia as a possible factor

    Shah and colleagues compared 19 autistic and 19 non-autistic adults and found no group difference in heartbeat accuracy. More pronounced alexithymia, however, was associated with lower accuracy. The samples were small; the question remains open.

  4. ADHD: few, small studies

    A systematic review by Bruton and colleagues (2025) found 18 studies. In three of five comparison studies, interoception was lower in ADHD; the two adult studies contradicted each other. All studies were snapshots, often with small groups; no cause of ADHD symptoms can be derived from them.

03

In everyday life: not just waiting for body signals

When signals arrive late or faintly or are hard to interpret, external cues can take over part of the work. These are editorial suggestions to try, not training or treatment for interoception.

  1. Fixed anchors instead of spontaneous signals

    Plan meals and drink breaks by the clock or link them to recurring events, such as a glass of water at the start of each new work block. Then your body does not have to get loud first for something to happen.

  2. A quick check at transitions

    When switching between two activities, a few questions are enough: Eaten? Had something to drink? Toilet? Too warm or too cold? A short list by the door or in your daily schedule is easier than constantly tuning in to your body.

  3. Plan long focus phases with an end

    In deep concentration, body signals often fade into the background. Set an end point beforehand and have something simple to eat and drink ready, so the transition afterwards does not need planning first.

  4. If observing is stressful or symptoms persist

    If paying attention to your body increases restlessness or constant checking, drop the observing and stick to fixed times. Persistent problems with eating, drinking, pain or going to the toilet should be checked by a doctor.

A practical example

Example: a working afternoon with fixed anchors

A fictional example shows how set times and transitions can complement body signals. It is not a rule and not a test of your own perception.

  1. 12:30 pmLunch by the clock, even without a clear feeling of hunger. Something simple is ready.
  2. Switching blocksBefore each new work block: refill the water glass and briefly go to the toilet.
  3. 3:30 pmQuick check: eaten, had a drink, warm enough, shoulders relaxed? One word per question is enough.
  4. Unclear signalGrowing irritability while reading is noted as possible hunger and checked with a snack.
  5. End of the focus blockStand up and have a drink; only then read messages.
  6. ReviewNote which anchor worked – without judging the day as a success or a failure.

Published and reviewed on · About the author

Sources for the background information

Scope and reliable sources

This page combines lived experience with general information. It does not replace diagnosis or treatment. Official health information is available from the German federal guides on ADHD and autism.

Written by Max Anton Schneider, founder of meinsystem.app. About Max

Common questions

What is interoception in simple terms?

Interoception is the perception of what is happening inside your own body: hunger, thirst, heartbeat, breathing, temperature, the urge to urinate or tension. It also includes interpreting these signals and responding to them.

Is weak interoception a diagnosis?

No. Interoception is a perceptual process, not a diagnosis. Differences in body awareness occur in many people, with and without autism or ADHD. A test or questionnaire alone does not explain a person.

Do autistic people sense body signals less well?

Not across the board. A recent meta-analysis found no significant difference in heartbeat perception in autistic adults, and questionnaire studies show contradictory results. Some autistic people nevertheless report noticing hunger, thirst or exhaustion late.

Why do I only notice hunger or thirst late?

There are many possible reasons: deep concentration, stress, sensory overload, a lack of fixed times, but also medication or illness. If it happens to you often or you have symptoms, talk to a doctor.

Can interoception be trained?

There are programs, for example from occupational therapy. So far, the evidence consists mainly of small pilot studies without a control group, so effectiveness has not been established. Fixed times for eating, drinking and breaks are organizational aids, not training.

Read more

Useful next steps

Noticing body signals late

Small everyday experiments for when you only notice hunger, thirst or exhaustion late.

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Understand alexithymia

When your own feelings are hard to identify and name – with the state of research and its limits.

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Ending hyperfocus

A personal account of eating, drinking and time in the tunnel, and an exit plan.

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Meal planning with AuDHD

Connect meals and shopping so that eating does not depend on gut feeling.

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Sensory overload in everyday life

A personal account of what can ease overwhelm.

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Understand monotropism

Why deep attention can push other signals into the background – as a model, not a diagnosis.

View

Anchors instead of gut feeling

Add times for eating, drinking and breaks as fixed steps in your daily routine.

Plan daily anchors

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