Why Your Child's Behaviour May Start in the Body, Not the Brain
A child’s brain and behaviour are influenced by gut health, inflammation, blood sugar, sleep, nutrient status, detoxification capacity, genetics, environmental load, immune activation and neurotransmitter balance. When these systems are under pressure, children may present with tantrums, anxiety, aggression, sensory seeking, poor focus, low mood, sleep issues, separation anxiety, emotional meltdowns or hyperactivity.
One of the biggest areas we assess is neurotransmitter function. Neurotransmitters are brain chemicals that help regulate mood, motivation, calm, sleep, focus and emotional control. For example, GABA is calming, serotonin supports mood and resilience, dopamine supports motivation and focus, and glutamate is excitatory. If a child has too much excitatory drive and not enough calming support, they may look like they are “overreacting,” when internally their nervous system is struggling to switch off.
This is where testing can be incredibly helpful.
We may use organic acids testing to look at current functional markers such as neurotransmitter metabolites, mitochondrial energy production, B-vitamin need, oxidative stress, gut yeast or bacterial overgrowth patterns, detoxification markers and nutrient demand. This gives us insight into what is happening in the child’s body right now.
We may use microbiome or stool testing to assess gut bacteria, inflammation, pathogens, parasites, digestive capacity and short-chain fatty acid production. The gut and brain are deeply connected through the gut-brain axis. If there is dysbiosis, poor digestion, inflammation or microbial imbalance, this can directly impact mood, sleep, immune tolerance and behaviour.
We may also assess hair tissue minerals or heavy metal markers where appropriate. Heavy metals and mineral imbalances can place stress on the nervous system and may interfere with neurotransmitter activity, detoxification and mitochondrial function. We are not looking at these results in isolation, but as one part of the bigger picture.
Blood testing may also be recommended to assess iron, vitamin D, B12, folate, zinc, thyroid markers, inflammation, blood sugar regulation and other nutrients essential for brain development and nervous system function. Low iron, low vitamin D, poor zinc status or blood sugar instability can all contribute to fatigue, irritability, poor concentration and emotional dysregulation.
We may also consider nutrigenomic testing, especially genes such as MTHFR and COMT. These genes do not “diagnose” a child or guarantee symptoms, but they can show predispositions in methylation, dopamine/adrenaline breakdown, detoxification and nutrient requirements.
For example, MTHFR can influence folate metabolism and methylation, which are important for neurotransmitter production, detoxification, energy and nervous system health. COMT helps break down dopamine, adrenaline and noradrenaline. Some children with COMT variations may be more sensitive to stress, stimulation or certain supplements, because their body may clear catecholamines more slowly. This can look like anxiety, sleep difficulty, emotional intensity, perfectionism, irritability or being constantly “switched on.”
The key is this: genes are not destiny. Genetics show potential vulnerability, but testing like OAT, bloods, stool and mineral analysis helps us understand how those genes are currently expressing in real life.
Treatment is then tailored.
Products we commonly consider may include magnesium, zinc, activated B vitamins or methylated nutrients when appropriate, omega-3s, choline, inositol, glycine, L-theanine, probiotics, prebiotics, digestive support, gut repair nutrients, herbal nervous system support and gentle detoxification support when indicated. We may also use specific herbs to support calm, sleep, digestion, immune balance or inflammation, depending on the child’s presentation and testing.
But we don’t just throw supplements at symptoms.
A child with anxiety and constipation may need gut motility, microbiome and magnesium support. A child with aggression and poor sleep may need glutamate/GABA balance, blood sugar support and mineral repletion. A child with hyperactivity may need dopamine pathway support, protein at breakfast, nervous system regulation and gut work. A child with low mood and fatigue may need mitochondrial, iron, B12, thyroid or inflammatory markers investigated.
Our goal is to help the child feel safer in their body, calmer in their brain and more capable of coping with the world around them. Because when the body is supported, behaviour often shifts in a way that feels more sustainable, compassionate and real.
