Sarah Khan, PhD  •  Integrative & Functional Nutritionist

Your Root Cause Assessment

Read through each of the 5 systems below and notice which one resonates most. Your pattern is in here.


System 1

The Gut

Bloating • gas • food sensitivities • reflux • IBS • history of antibiotic use

Your gut produces over 90% of your serotonin, houses 70% of your immune system, and is the primary site of nutrient absorption. When gut integrity breaks down — through dysbiosis, intestinal permeability, or bacterial overgrowth like SIBO — the effects ripple into every other system. In clinical practice, addressing the gut first consistently produces the fastest results, even when it isn’t the loudest complaint.

System 2

The Immune System

Autoimmune diagnosis • chronic inflammation • frequent infections • food reactivity • slow healing

Autoimmunity exists on a spectrum long before a formal diagnosis. When the immune system loses tolerance, it begins attacking the body’s own tissue. This is almost always downstream of another driver: gut permeability, chronic infections, toxin burden, or unresolved stress. Treating the immune system without addressing its root is managing a symptom, not solving a problem.

System 3

The Hormonal System

Fatigue • weight changes • hair loss • brain fog • irregular cycles • wired but tired

The hormonal system is a web, not a hierarchy. Thyroid affects sex hormone binding. Cortisol affects insulin. Estrogen affects thyroid receptor sensitivity. Treating any single hormone in isolation misses the interconnections that are almost always central to the picture. Most Hashimoto’s patients have never had a full functional thyroid panel — that’s where the story almost always starts.

System 4

The Metabolic System

Energy crashes • carb cravings • weight difficulty • afternoon fatigue • waking at 2–3am

Metabolic dysfunction begins long before a diabetes diagnosis. Insulin resistance creates disrupted energy, increased inflammation, hormonal imbalance, and impaired cellular repair — often for years before standard labs flag anything. Many patients with this pattern have been told their numbers are fine, because standard care waits until dysfunction is severe before acting.

System 5

The Nervous System & HPA Axis

Chronic stress • anxiety • poor sleep • symptoms that worsen under stress • history of trauma

The HPA axis is the body’s master stress response system. When chronically activated, it dysregulates cortisol, disrupts sleep, impairs immunity, and creates a physiological state that makes healing from everything else significantly harder. This is the system most often dismissed in conventional care — and most often central to treatment-resistant cases.


Ready to find your primary driver?

Apply for a complimentary discovery call

Most people recognize themselves in more than one system — that’s exactly right. A discovery call maps your specific pattern and identifies the right starting point for your case.

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