If your child has ADHD, or you suspect they might, you've probably heard plenty about medication, behavioural therapy, and classroom strategies.

One piece often gets left out of the conversation: what's on your child's plate, and whether their body is getting what it needs to support focus, mood, and behaviour.

As a naturopathic doctor and registered nurse, taking a close look at a child's nutrition is one of the most useful things I can do to support families managing ADHD.

Here's what that looks like in my practice, and what you can expect if we work together.

Why does food matter for ADHD?

Your child's brain builds its chemical messengers, including dopamine and norepinephrine, from nutrients in food. (messengers most involved in ADHD)

Research has found that children with ADHD tend to have lower levels of zinc, iron, magnesium, omega-3 fatty acids, and B-vitamins than their peers.

Dietary patterns matter too.

Studies link diets high in processed foods, sugary drinks, and fried foods with more intense ADHD symptoms.
Diets rich in vegetables, fruit, fish, and whole foods are linked with better outcomes.

To be clear, food doesn't cause ADHD. But what your child eats may make symptoms easier or harder to manage, and nutrition is something we can work with.

What does a nutrition assessment involve?

No single test or questionnaire tells the whole story. The most helpful picture comes from combining a few different pieces.

1. A close look at what your child actually eats

I use a few tools, each showing something a little different:

A 24-hour dietary recall. We start here. Together, we'll walk through everything your child ate and drank in the last day. It's a quick, relaxed conversation that catches the foods, brands, and portion sizes that are easy to miss on paper.

My Food Frequency Questionnaire. Next, we'll fill this out together during your visit. It's a simple checkbox form that asks how often your child ate everything from leafy greens and fish to chips and soft drinks over the past year. It also asks about supplements, foods your child avoids, and about food access. It shows us the patterns, not just one day.

A 3-day food record, if needed. If we need a closer look, I may ask you to jot down what your child eats and drinks over three days, usually two weekdays and one weekend day. I save this tool for follow-up visits, when it can show us how things are changing or help us answer a specific question.

Together, these show which nutrients your child is likely getting plenty of, and where the gaps might be.

2. Growth and measurements

I'll take your child's height and weight. It's a quick, low-key way to set a baseline we can track over time. This matters especially if your child takes stimulant medication, since it can affect appetite and growth.

3. Optional blood testing

Blood work isn't required, but when it makes sense I offer targeted testing for the nutrients most often linked with ADHD. Instead of guessing at a deficiency, we can confirm it.

Nutrients I commonly look at include:

Zinc, which helps your child's body make dopamine and norepinephrine.
Ferritin (iron stores), since low levels are linked with more severe ADHD symptoms.
Copper, another helper in making those brain chemicals.
Magnesium, linked with hyperactivity and sleep difficulties.
Vitamin D, since low levels are common in Canadian kids and linked with inattention.
Omega-3 fatty acids, which tend to run lower in children with ADHD.
Vitamin B12 and folate, which are important for brain development.

We decide together whether testing is worthwhile, based on what the dietary picture shows and your child's overall health.

4. Food access and your family's reality

Research shows that children in households that sometimes struggle to afford nutritious food are more likely to have ADHD, and more likely to have more intense symptoms.

That's why a short food security screen is part of every assessment. It's never about judgment. A diet or supplement plan only helps if it actually fits your budget, your schedule, and your kitchen.

A quick word on elimination diets

You may have read about removing food dyes, additives, gluten, or dairy to help with ADHD symptoms. Some families do report improvements, but elimination diets can lead to nutritional gaps and added stress around food, especially in growing kids.

If you're considering one, it's best done with proper monitoring and dietitian support when needed.

What happens next: the Children's ADHD Support Program

The nutrition assessment is the first step of my Children's ADHD Support Program, a step-by-step, whole-child approach for children and teens ages 3 to 18.

It moves through three phases.

Investigate looks closely at your child's health and nutrition.

Replenish fills nutritional gaps through food, targeted supplements, or both.

Targeted ADHD Support adds more strategies, only if needed. Your child only moves forward as far as they need to.

The program is designed to work alongside your child's doctor and care team, never in place of them.

Learn more about the Children's ADHD Support Program →

Frequently asked questions

My child is already on ADHD medication. Is a nutrition assessment still useful?

Yes, and it may be even more helpful. Stimulants often suppress appetite, which can affect how much your child eats and lead to nutritional gaps over time. Tracking growth, intake, and nutrient levels is especially valuable.

Nutrition support and medication aren't either/or. They work together.

Does my child need blood work?

No. It's offered only when it would change our approach. For some kids, the dietary assessment alone is enough. For others, such as those with very limited diets or more intense symptoms, confirming nutrient levels is genuinely helpful.

We'll decide together.

My child is an extremely picky eater. Does that matter?

It does, and it's one of the things I hear most from parents of children with ADHD. Selective eating is more common with ADHD and can limit nutrient variety.

Instead of focusing on what your child won't eat, we look at what they are getting, where the real gaps are, and which practical strategies can fill them without turning every meal into a battle.

Can nutrition replace ADHD medication?

For most children, nutrition is a complement to other treatments, not a replacement.

For families taking a non-medication-first approach, it can be one important pillar alongside behavioural strategies, sleep, and movement.

I work alongside your child's medical team and will never recommend stopping or changing prescribed medication. That decision is always between you and your child's prescribing doctor.

Is this right for your child?

A nutrition assessment is a helpful starting point for almost any child with ADHD, whether they're newly diagnosed, already on medication, or you're exploring other options. It doesn't replace medical care. It fills in a piece of the picture that often gets overlooked.

If you're in Barrie or anywhere in Ontario (I see families in person and virtually), I'd love to hear from you. Book a free 15-minute Meet & Greet and we'll talk about whether the Children's ADHD Support Program is the right next step for your child.

This post is for educational purposes only. Nutritional recommendations should always be individualized to your child's health history and circumstances. Please consult a qualified healthcare provider before making changes to your child's diet or supplement routine.