The Hidden Root Causes of ADHD (And How a Root-Cause Approach Can Help)

By Dr. Alyssa McPeak, DC, CFMP

ADHD is often labeled as a “brain disorder,” but in functional medicine and chiropractic care, we see something much deeper happening: the brain and body are struggling to communicate clearly.

For many kids (and adults!) with ADHD symptoms like inattention, hyperactivity, impulsivity, anxiety, emotional outbursts, and poor focus, the root cause isn’t just a chemical imbalance—it’s nervous system dysregulation plus underlying imbalances in the body.

Let’s unpack some of the most common hidden root causes of ADHD and how a holistic, root-cause approach can help.

1. Nervous System Dysregulation

The nervous system controls focus, emotional regulation, sleep, digestion, and stress responses. When it’s stuck in “fight-or-flight,” the brain has a hard time slowing down enough to focus, regulate emotions, or learn.

Signs of nervous system dysregulation can include:

• Hyperactivity

• Anxiety

• Poor sleep

• Sensory sensitivities

• Emotional outbursts

• Trouble calming down

Chronic stress (physical, emotional, or chemical) keeps the nervous system in survival mode. A dysregulated nervous system makes it nearly impossible for a child’s brain to process information calmly and clearly.

How chiropractic helps:

Gentle, neurologically-focused chiropractic care helps regulate the nervous system by reducing interference along the spine. When the nervous system is more balanced, the brain and body communicate better—often improving focus, emotional regulation, and sleep.

2. Nutrient Deficiencies

The brain is one of the most nutrient-demanding organs in the body. Deficiencies can directly impact attention, memory, mood, and behavior.

Common nutrients linked to ADHD symptoms include:

• Magnesium (calming, nervous system support)

• Zinc (brain signaling and neurotransmitters)

• Iron (oxygen delivery to the brain)

• Omega-3 fatty acids (brain structure and function)

• B vitamins (energy and neurotransmitter production)

When the body is undernourished at the cellular level, the brain simply can’t perform at its best.

How functional medicine helps:

Functional medicine testing can identify deficiencies and guide personalized nutrition and supplementation to support healthy brain function.

3. Food Sensitivities & Inflammation

Food sensitivities don’t always show up as hives or stomach pain. Sometimes they show up as behavioral changes, brain fog, hyperactivity, immune suppression, or mood swings.

Common triggers can include:

• Gluten

• Dairy

• Artificial dyes and preservatives

• Inflammatory seed oils

• Sugar and processed foods

Inflammation in the gut can create inflammation in the brain through the gut-brain connection. If the gut is inflamed, the brain often follows.

How functional medicine helps:

Food sensitivity testing, elimination diets, and gut-healing protocols can reduce inflammation and improve focus, mood, and behavior.

4. Heavy Metal Toxicity

Heavy metals like lead, mercury, aluminum, and cadmium can interfere with brain signaling and neurotransmitter function. Even low-level exposure can impact attention, memory, and behavior—especially in developing nervous systems.

Sources may include:

• Old paint or pipes

• Environmental exposure

• Vaccines

• Pots and pans

• Aluminum foil

• Personal care products

• Prenatal exposure

Heavy metals can create neurological “noise,” making it harder for the brain to regulate focus and behavior.

How functional medicine helps:

Testing can assess heavy metal burden and guide gentle, safe detox pathways that support the body’s natural ability to eliminate toxins.

5. Parasites & Gut Inflammation

The gut and brain are in constant communication through the gut-brain axis. Parasites or chronic gut inflammation can cause:

• Nutrient malabsorption

• Chronic inflammation and leaky gut

• Immune system activation

• Brain fog

• Irritability and mood changes

When the gut is under attack, the brain often pays the price.

How functional medicine helps:

Stool testing can identify parasites or imbalances in the microbiome. Targeted protocols help reduce inflammation and restore gut health, which often leads to improvements in behavior, focus, and emotional regulation.

6. Adrenal Dysfunction & Chronic Stress

The adrenal glands regulate cortisol—the body’s main stress hormone. Chronic stress in kids (school pressure, sensory overload, trauma, lack of sleep, poor nutrition) can dysregulate cortisol patterns.

This can show up as:

• Wired-but-tired behavior

• Trouble focusing

• Emotional reactivity

• Energy crashes

• Difficulty sleeping

When cortisol is out of balance, the brain struggles with attention, impulse control, and emotional regulation.

How functional medicine helps:

Functional medicine testing can assess adrenal function and guide lifestyle, nutrition, and supplementation to restore healthy stress responses.

Genetic & Prenatal Influences Matter Too

If parents struggle with ADHD symptoms, emotional dysregulation, anxiety, or chronic stress, this can influence a child’s nervous system development as well. This isn’t just genetics—it’s also the in-utero environment. If mom had nutrient deficiencies, high stress, inflammation, toxin exposure, or hormonal imbalances during pregnancy, the baby may not receive all the building blocks needed for optimal brain and nervous system development. Nutrients like iron, choline, omega-3s, B vitamins, iodine, and magnesium are critical for building a healthy brain and nervous system in utero. When those foundations are shaky, kids may be more vulnerable to attention, sensory, and regulation challenges later on—but the good news is these foundations can be supported and strengthened after birth with the right nervous system care, nutrition, and root-cause healing approach.

How Chiropractic + Functional Medicine Address ADHD at the Root

At Roots Wholistic Health, we don’t just look at symptoms—we ask why the symptoms are happening.

✨ Chiropractic Care

• Regulates the nervous system

• Improves brain-body communication

• Supports emotional regulation, sleep, and focus

• Reduces stress on the developing nervous system

✨ Functional Medicine

• Identifies nutrient deficiencies

• Uncovers food sensitivities

• Evaluates gut health, toxins, and adrenal function

• Creates personalized plans to support brain chemistry naturally

Together, chiropractic and functional medicine help remove interference so the brain and body can function the way they were designed to.

A Different Way to Look at ADHD

ADHD symptoms are not a character flaw or a “broken brain.” They are signals from the brain and body asking for support.

When we calm the nervous system, nourish the brain, reduce inflammation, and remove toxic stressors, many kids (and adults!) experience:

• Better focus

• Improved emotional regulation

• Calmer nervous systems

• Better sleep

• Improved learning and behavior

Ready to Address the Root Cause?

If your child is struggling with focus, emotional regulation, or hyperactivity, there may be more going on beneath the surface.

At Roots Wholistic Health, we specialize in supporting the nervous system and uncovering hidden root causes so your child’s brain and body can communicate better—and thrive.

👉 Schedule a consultation to explore a root-cause approach to ADHD and nervous system health.