What if insulin resistance is quietly driving inflammation, weight gain, and thyroid dysfunction years before blood sugar ever looks abnormal?

In this episode of Modern Thyroid and Wellness, McCall McPherson sits down with endocrinologist Dr. Alessia Roehnelt for an in-depth conversation about insulin resistance and why it can be such an important marker of long-term metabolic health.

Dr. Roehnelt explains how insulin functions in the body, what happens when insulin resistance develops, and why chronically elevated insulin can contribute to inflammation, weight gain, metabolic dysfunction, and disease progression.

They also explore the bidirectional relationship between insulin resistance and hypothyroidism, including how thyroid dysfunction can worsen metabolic health and how insulin resistance can complicate thyroid function and treatment.

🔑 In This Episode:

What insulin resistance is and how it develops
Why insulin resistance may appear before prediabetes or type 2 diabetes
Common physical and metabolic signs of insulin resistance
Acanthosis nigricans, carb sensitivity, and rapid weight fluctuations
The relationship between insulin resistance and hypothyroidism
How insulin resistance may affect thyroid hormone absorption and conversion
Why fasting insulin can provide useful information beyond A1c alone
“Normal” vs. optimal fasting glucose, insulin, and A1c values
Why population-based lab ranges do not always reflect optimal health
The role of vitamin D in metabolic and hormonal health
Fatty liver markers including AST and ALT

🏃‍♀️ Improving Insulin Sensitivity

Dr. Roehnelt and McCall discuss foundational strategies including:

Consistent, restorative sleep
Strength and resistance training
Reducing refined carbohydrates
Pairing carbohydrates with protein and fat
Using continuous glucose monitors to better understand personal responses
Strategic intermittent fasting when appropriate

💊 Medications Discussed

Metformin

Improves insulin sensitivity
Has a long history of clinical use
Can be a cost-effective early intervention

GLP-1 receptor agonists

Reduce appetite and slow gastric emptying
Lower liver glucose production
Improve insulin signaling
May help reduce inflammation in appropriate patients

🌿 Key Takeaways

Insulin resistance can often be improved when identified early.

“Normal” lab values do not always tell the entire story, and weight gain is far more complex than calories in versus calories out.

One of the biggest themes in this episode is that inflammation connects metabolic dysfunction, thyroid disease, and autoimmunity, making individualized, whole-body evaluation incredibly important.

📖 Pre-Order Take Back Your Thyroid + Get a Free Bonus

Pre-order McCall McPherson’s new book, Take Back Your Thyroid, and choose one free bonus:

🎓 Thyroid Empowered Course — a $399 value

🩺 $150 off a new patient visit at Modern Thyroid Clinic

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📍 Connect with Dr. Alessia Roehnelt

Website & Practice:

https://www.endohealthdoc.com

Instagram:

https://www.instagram.com/endohealthdoc/

Facebook:

https://www.facebook.com/alessia.roehnelt