Does The Gut Affect ADHD?
When most people think about ADHD, they imagine challenges with focus, organisation or impulsivity. But what many don’t realise is that ADHD is not just a brain-based condition – the gut plays a significant role too. In fact, research increasingly shows that gut health can directly influence attention, mood, behaviour and overall brain function.
The Gut–Brain Axis: Your ‘Second Brain’
Your gut is often referred to as your second brain because it communicates constantly with your central nervous system through the gut–brain axis. This two-way communication means:
- Your brain affects your gut
- Your gut affects your brain
When you’re living with ADHD, this feedback loop becomes even more important. Stress, emotional dysregulation and overstimulation (common experiences for people with ADHD) send signals from the brain to the gut, altering digestion, motility and gut bacteria.
At the same time, an unhealthy gut can send inflammatory or disruptive signals back to the brain, worsening ADHD symptoms like poor concentration, emotional volatility, anxiety and fatigue.
Gut Bacteria and ADHD: Why Microbiome Balance Matters
Your gut microbiome is responsible for producing many of the body’s neurotransmitters, including serotonin and dopamine, both of which are commonly low in people with ADHD.
When dysbiosis (an imbalance of gut bacteria) occurs, it can lead to:
- Reduced neurotransmitter production
- Increased inflammation
- Poor nutrient absorption
- Food intolerances
- Worsening ADHD symptoms
Many adults with ADHD experience gut dysbiosis without realising it. Symptoms may include bloating, constipation, diarrhoea, reflux, eczema or food cravings.
Gluten, Dairy and ADHD: What’s the Connection?
Gluten sensitivity, casein sensitivity and even coeliac disease have been strongly linked with ADHD. One of the reasons is that when the gut is inflamed or ‘leaky,’ proteins from gluten and dairy are not broken down properly.
These partially digested proteins called peptides, can cross the blood–brain barrier and act like opioids in the brain. These foods can create an addictive, morphine-like effect in the brain. They can trigger symptoms such as ‘zoning out’, fatigue and food cravings.
Removing gluten and dairy (when appropriate and supervised) can reduce inflammation, support gut healing and improve cognitive and behavioural symptoms. However, it is advised to seek professional advice regarding this. Every person is unique – you may not have a problem with gluten or casein.
Leaky Gut, Inflammation and Neuroinflammation
When someone has ‘intestinal permeability’ or ‘leaky gut’, particles that shouldn’t enter the bloodstream start to slip through. This can include toxins, food proteins and bacteria. This process triggers systemic inflammation, which can quickly reach the brain.
Neuroinflammation is increasingly recognised as a key factor in ADHD, influencing:
- Mood
- Impulse control
- Emotional regulation
- Hyperactivity
- Inattention and many more
Nutrients, Absorption and ADHD
If you have dysbiosis or leaky gut, your ability to absorb nutrients decreases significantly. This means key nutrients for brain health such as iron, zinc, magnesium, omega-3s and B-vitamins can be very low. Low nutrient levels are strongly associated with worsening ADHD symptoms.
Healing the Gut to Support ADHD
As mentioned above, the gut is talking to the brain and vice versa. This is why we do the comprehensive gut test – so that we know exactly what’s going on in there!
Every individual with ADHD is unique, therefore, a personalised approach always works best.
If you’d like to get to the bottom (excuse the pun!) of your gut and ADHD, why not book an Initial Consultation now.