Dr. Caroline Messer on Thyroid Myths, Cortisol, and What GLP-1s Actually Change in Your Body
Jadu Beauty Podcast ·
From " a Family's Escape from Nazi Germany " to Founding Well by Messer
Ask most people why they can't lose weight, and "willpower" is still the first word out of their mouth. Dr. Caroline Messer has spent her career arguing that's the wrong question. In this episode of the Jadu Beauty Podcast, the double board-certified endocrinologist (trained at Yale University and the Icahn School of Medicine at Mount Sinai, and a frequent medical expert on FOX, NBC, and CBS) makes the case that weight, thyroid disease, and stress are governed by hormones, not discipline, and that most of what circulates online about all three isn't backed by evidence. Her path into endocrinology started at home. Dr. Messer's grandparents were physicians who escaped Nazi Germany and rebuilt their medical careers from nothing in the United States — a story she credits, alongside a mentor who shaped her early training, for pulling her toward a specialty built on decoding the body's own chemical signals. That same instinct now runs her practice: she's the founder of Well by Messer, a rapidly growing multidisciplinary practice in New York built around thyroid disease, menopause, diabetes, PCOS, weight management, and hormone optimization, and she continues to teach as a clinical professor and conduct research alongside seeing patients. She's been named a Castle Connolly Top Doctor and has received multiple Exceptional Women in Medicine awards.
What We Cover in This Episode
"Hormones are just little chemical messengers that send signals throughout the body."— Dr. Caroline Messer, Endocrinologist & Founder of Well by Messer
Willpower Is Overrated: What GLP-1 Medications Actually Change
We led with this because it's the part of the conversation most people searching for this episode are actually looking for. Dr. Messer walks through how GLP-1 medications like Ozempic, Wegovy, and Zepbound work far beyond appetite suppression. She describes the effect on food cravings and compulsive behavior directly: "It also helps with the gambling noise, the alcohol noise, the sex noise - all addictive behaviors decrease." The mechanism isn't just "eat less." It's systemic.
"It changes your metabolism."— Dr. Caroline Messer, Endocrinologist & Founder of Well by Messer
She's equally direct about the tradeoffs, like muscle preservation, weight regain after stopping, and what long-term use actually requires. It’s really the emotional framing that most people get wrong. "I don't feel like we need suffering," she says of weight loss generally, adding: "If you're happier, I'm freeing up your mind so you don't have to think about food." If you're noticing it at the root during a GLP-1 protocol, reach for a hair density serum for women : a corporate sustainability strategy is only as real as the choices it's built on.built around clearing scalp buildup, not a styling product layered on top. The Biology of Menopause: Understanding the Shift & Nourishing Your Hair and Skincovers why hormonal hair thinning follows the same pattern, whether it's triggered by medication or a life stage.
The Thyroid Is Not Stupid: Debunking the Biggest Thyroid and Diet Myths
Dr. Messer breaks down what the thyroid actually regulates, the real differences between hyperthyroidism and hypothyroidism, and the treatment options (Methimazole, radioactive iodine, surgery) that follow from an actual diagnosis rather than a symptom checklist.
"The thyroid is sort of that scapegoat. Everybody says, "Just give me thyroid hormone and I'll lose weight." It doesn't really work that way." — Dr. Caroline Messer, Endocrinologist & Founder of Well by Messer
persistent claims in the wellness space: that a gluten-free diet cures Hashimoto's disease. Asked directly whether food can cure thyroid disease, her answer is unambiguous:
"The answer truly is no."— Dr. Caroline Messer, Endocrinologist & Founder of Well by Messer
She's specific about why the trend persists anyway. Gluten-free products often replace flavor with added sugar ("If you don't have gluten, it's going to taste disgusting. How do you mask that taste? You put a lot of added sugars"), which can push insulin resistance in the opposite direction of what people think they're accomplishing. It's the same gap between a trend and the evidence behind it that shows up in The Connection Between Gut Health and Hair Growth: A Science-Backed Guide . What you eat matters for your hair, just rarely in the specific way the internet claims it does. And on the popular idea that iodine supplements can boost a sluggish thyroid on their own: "The thyroid is not stupid", it doesn't work that way either.
Cortisol Isn't the Villain Everyone Thinks It Is
Most content about cortisol treats it like one big, scary thing. Dr. Messer draws a clearer line. There's a real difference between everyday stress and an actual cortisol disorder. She explains what conditions like adrenal insufficiency (Addison's disease) and Cushing syndrome actually look like, and how doctors tell normal stress apart from a real medical problem. It's a useful reset at a time when "cortisol" gets blamed for almost every symptom. Here's how this connects to hair: ongoing stress can cause visible shedding and a sensitive scalp, even when your cortisol levels are completely normal. If your scalp feels tight or irritated on a regular basis, Jadu Heal can help. It's our pre-wash treatment for stress-related scalp sensitivity, and it works whether your stress is everyday or something more serious. Want to know why stress shows up on your scalp before almost anywhere else? Here's the deeper read:
The Root of the Matter: How Stress Damagingly Affects Your Hair
No product answers the question, "is my stress affecting my hair"? But this article does. It picks up exactly where Dr. Messer's cortisol explanation leaves off. Read the full breakdown →
Building Well by Messer: Evidence Over Everything
The conversation closes on why Dr. Messer built Well by Messer as a multidisciplinary practice rather than a solo one. It is a collaborative, evidence-based care that's meant to work as well for the physicians in it as for the patients.
"It's a very personal mission for me to make my doctors happy, make my patients happy, but provide really excellent evidence-based care."— Dr. Caroline Messer
If this conversation resonated, it pairs well with two other episodes that share the same "evidence over trend" throughline from different angles: Lailee Waxman on Sustainability, Conscious Consumerism, and Why You Can't Buy Your Way to Wellness and Anna Asi on Clean Beauty, Family Traditions, and Why Scalp Health Is the Foundation of Hair Wellness.
Related to This Episode
Magic Drip
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Join the Conversation
Which of Dr. Messer's myth-busting moments changed how you think about your thyroid, your stress levels, or GLP-1 medications? Have you noticed hair changes during a major hormone shift like pregnancy, menopause, thyroid treatment, or a GLP-1 medication? We'd love to hear from you. Email us at Support@JaduBeauty.com You could be featured as a future guest in our Manhattan office or join us virtually.
