Courtney Garfoot, AADPA Conference 25-26 July 2026, Melbourne
What changes when nutrition joins the ADHD conversation
Twenty-two children, every one of them meeting the clinical threshold for ADHD, most of them tricky to feed in exactly the way ADHD makes kids tricky to feed. Their nutrition got the same clinical attention their medication gets, with feeding therapy added where a child needed it, and their symptoms were tracked properly along the way.
Most of the children improved while in care. For close to two in three, the improvement held after care ended.
One girl arrived at six with about ten tolerated foods and a meltdown at most meals. At ten, she eats a varied diet, is growing well, and no longer needs extra support at school. Her mum puts it better than we can: “She’s excelling in all ways. Every day, she’s still willing to try new foods.”
If you want the whole thing (we totally would too!), here it is.
For all the focus on medication and behaviour, ADHD care often leaves nutrition out of the conversation. Yet what a child eats shapes how ADHD symptoms present.
The catecholamine pathways stimulants target are built and run on nutrients. Iron drives dopamine synthesis, zinc modulates its transport, magnesium and long-chain omega-3s support neuronal signalling, and the neurotransmitters themselves are made from amino acids. These are the exact nutrients most children with ADHD are deficient in.
And these are the children whose eating is hardest to get right, with high rates of selective eating, sensory-driven food aversion, and gastrointestinal symptoms.
Nutrition is not adjacent to ADHD. It sits inside the same biology, and it is the part most often left off the management plan.
22 children aged 4 to 15 who met the clinical threshold for ADHD, contributing 101 SNAP-IV observations across the period of care.
68% met clinical thresholds across all three SNAP-IV domains (inattention, hyperactivity/impulsivity, opposition/defiance) simultaneously, representing a complex cohort.
Individualised nutritional care focused on restoring diet quality and correcting nutrient status, escalating to targeted interventions where clinically indicated.
Foundation: diet quality, sleep, physical activity, and stress.
Nutrient deficiencies and gastrointestinal considerations: added where the history indicated.
Feeding therapy: added for the subset of children whose food range, sensory profile, or mealtime function warranted it. This is where limited food range was treated directly, so that dietary change became possible for that cohort.
Mean SNAP-IV scores fell from baseline to latest observation across all three domains: inattention, hyperactivity/impulsivity, and opposition/defiance.
95% of children improved during care, and 64% sustained improvement at follow-up.
Presentation at age 6. Extensive food aversion, approximately 10 tolerated foods, daily mealtime meltdowns, poor sleep, requiring additional school support, at risk of grade repetition. Subsequently diagnosed with Autism Spectrum Disorder Level 2, ADHD, Sensory Processing Disorder, and dyslexia. Both individualised nutrition and feeding therapy were indicated.
Review at age 10. Consuming a varied diet, tracking healthy growth on centile, progressing in mainstream education without additional support.
Individualised nutrition, with feeding therapy where clinically indicated, was associated with meaningful, measurable reductions in ADHD symptoms across a complex cohort, and the benefit held over a four-year follow-up. These findings support nutritional and feeding therapy interventions as a routine component of multidisciplinary ADHD care.
De-identified data used with consent; case shared with written parental consent.
|
Domain
|
Mean change
|
Cohen's d
|
95% CI
|
p-value
|
Interpretation
|
|---|---|---|---|---|---|
|
Inattention
|
-2.0
|
-0.35
|
TBC
|
0.114
|
Small
|
|
Hyperactivity/impulsivity
|
-1.8
|
-0.37
|
TBC
|
0.095 (did not reach significance)
|
Small
|
|
Opposition/defiance
|
-1.2
|
-0.46
|
TBC
|
0.042
|
Small-to-moderate
|
|
Composite
|
-4.9
|
-0.31
|
TBC
|
Not calculated
|
Small
|
Cohen’s d benchmarks: 0.2 small, 0.5 moderate, 0.8 large. Effect sizes here are modest by design: this is an adjunctive nutritional intervention, not a replacement for medical management, so a small-to-moderate effect is the expected and honest range.
Garfoot, C. (2026). Food for thought: What changes when nutrition joins the ADHD conversation (Poster presentation). Australasian ADHD Professionals Association (AADPA) Annual Conference July 2026, Melbourne, Australia.
If this work overlaps with yours, or you’d like the summary for a journal club or team meeting, take it with our blessing. For collaboration or mentoring, contact Court directly.
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