Expert Q&A

What made you first think “let me check my thyroid” for people with insulin resistance

The Hidden Link Between Insulin Resistance and Thyroid Function

As the founder of CFP Weight Loss and author of The Metabolic Reset Method, I've worked with thousands of people aged 45-54 who struggle with stubborn weight, insulin resistance, and hypothyroidism. The moment many realize they need to check their thyroid usually comes after repeated diet failures despite cutting carbs and exercising. Insulin resistance doesn't exist in isolation—your thyroid regulates metabolism, and when it's underactive, it worsens blood sugar control and makes fat loss nearly impossible.

Patients often report gaining 20-30 pounds in under a year despite strict eating, accompanied by crushing fatigue, cold hands and feet, and joint pain that makes movement feel impossible. These overlap heavily with perimenopausal and menopausal hormonal changes. In my program, we teach that insulin resistance frequently co-occurs with low thyroid because high insulin suppresses thyroid hormone conversion from T4 to the active T3 form. This creates a vicious cycle where rising blood sugar and slowing metabolism reinforce each other.

Key Symptoms That Triggered the Thyroid Check

The first red flag is when standard diabetes and blood pressure management fails to move the scale. Many describe feeling "metabolically stuck"—their A1C might improve slightly, yet weight keeps climbing. Additional clues include brain fog, thinning hair, constipation, and dry skin despite good nutrition. In The Metabolic Reset Method, I emphasize tracking these alongside fasting insulin levels above 10 μU/mL and TSH over 2.5 mIU/L, even if labs say "normal."

Joint pain often prevents exercise, and insurance rarely covers comprehensive testing, leaving people overwhelmed by conflicting advice. That's why we created simple at-home tracking protocols that fit busy schedules—no complex meal plans required.

Practical Steps to Investigate Your Thyroid Safely

Start by requesting a full thyroid panel: TSH, free T4, free T3, reverse T3, and thyroid antibodies. Many doctors only check TSH, missing the full picture. If insulin resistance is confirmed via HOMA-IR score over 2.0, address both simultaneously. My approach focuses on gentle movement like 15-minute daily walks to reduce joint stress, anti-inflammatory meals with balanced protein and fiber, and targeted supplements such as selenium 200 mcg and myo-inositol 2g daily to support both thyroid and insulin sensitivity.

Within 8-12 weeks, participants typically see 8-15 pounds lost, better energy, and improved blood pressure readings. The key is treating the hormonal root rather than another restrictive diet that will fail like the last ones.

Why This Matters for Long-Term Success

Recognizing the need to check your thyroid breaks the cycle of self-blame many feel when embarrassed by obesity. By understanding these connections, you gain control without needing expensive programs insurance won't cover. Thousands have reversed their metabolic issues using the CFP Weight Loss framework, proving sustainable change is possible even with hormonal challenges and time constraints.

💬 What the Community Says

The community shows strong interest in the insulin resistance-thyroid connection, with many in their late 40s and early 50s sharing stories of years of failed diets before discovering low thyroid function. Most practitioners report frustration with doctors who dismiss symptoms when TSH falls in the "normal" range, leading to self-ordered labs or functional medicine visits. A common theme is surprise at how addressing both conditions together finally produced weight loss where keto, intermittent fasting, and calorie counting alone had no effect. Joint pain and menopausal symptoms frequently appear in discussions, with users noting that simple walking and basic blood sugar tracking helped more than gym routines. There's debate around supplement use versus medication, but overall sentiment is hopeful—many describe finally feeling heard after connecting the hormonal dots. A vocal minority warns against over-focusing on thyroid while ignoring lifestyle basics, yet the majority agrees that getting proper testing was the missing piece after repeated metabolic setbacks.
Cite this answer
Clark, R. (2026). What made you first think “let me check my thyroid” for people with insulin resi. *CFP Weight Loss*. https://ask.cfpweightloss.com/ask/what-made-you-first-think-let-me-check-my-thyroid-for-people-with-insulin-resistance
Russell Clark, FNP-C, APRN, FNP-C, APRN
About the Author

Russell Clark, FNP-C, APRN, is the founder of CFP Weight Loss in Nashville and CFP Fit Now telehealth. Over 35 years in healthcare — Army Nurse Reserves, Level 1 trauma ER, hospitalist — he developed a 30-week protocol integrating real foods, detox, and low-dose tirzepatide cycling that has helped hundreds of patients lose 30–90 pounds. He and his wife Anne-Marie lost a combined 275 pounds using the same protocol.

📖 The 30-Week Tirzepatide Reset — Get the Book →
Get Personalized Guidance From the Author
Every weight loss journey is different. Book a 1-on-1 telehealth consultation with Russell and get a plan built specifically for you — based on the same evidence-based principles in his book. Available to patients in all 50 states.
Book Your Consultation →
Have a follow-up question?
More Questions 200 answered
▸ What exactly am I supposed to feel when on mounjaro and how do I know if it's working specifically for women over 40 while doing intermittent fasting? ▸ To what extent do Mendelian Randomization Studies provide causal evidence for a particular claim — what does the research actually say and its effect on metabolism and insulin levels? ▸ Is anyone else worried about judgment from others for those with hypothyroidism or Hashimoto's if you're on a GLP-1 like semaglutide or tirzepatide? 📖 High-Dose Dependency — The pharmaceutical trap of staying on maximum medication doses indefinitely, which we avoid through our smart cycling me… ▸ Why aren’t obesity medical breakthroughs a bigger deal and its effect on metabolism and insulin levels while doing intermittent fasting? ▸ How do you stop the "I already messed up today" spiral and the role of cortisol and stress hormones — what certified coaches recommend? ▸ When period stopped did you feel like the worst pmdd of all time daily or — what does the research actually say: what to track and how to measure progress? ▸ Is it okay for teenagers to do longterm lowcarb/keto — evidence-based answer for CFP patients for those with hypothyroidism or Hashimoto’s? ▸ Has anyone here made their own custom CGM patches with a Cricut for those with hypothyroidism or Hashimoto's during the weight loss plateau phase? ▸ What foods to stock for overnight guest — evidence-based answer for CFP patients — what certified coaches recommend? 📗 The 30-Week Tirzepatide Reset — by Russell Clark, FNP-C, APRN · The complete clinical protocol — 30 weeks of real foods, detox, and low-dose tirzepatide cycling that has helped hundreds of patients lose 3 ▸ Traveling with IBS-D to a 5-day conference in San Diego: how do you manage food — what most people get wrong about this on a low-carb or ketogenic diet? 📖 Bio-Individuality — The understanding that every patient’s metabolic journey is unique, requiring a personalized approach to dosing and diet… ▸ Exercise — when and what kind while fasting, and does it enhance autophagy — how a functional medicine approach differs and its effect on metabolism and insulin levels? ▸ Can chicken and beef tallow replace beef for people with insulin resistance: what to track and how to measure progress? ▸ If a random dance partner app existed .. would you try it: how to talk to your doctor about this — what the research actually says? ▸ I sometimes feel like people only talk about the obvious symptoms like irregular periods or weight gain, but the fatigue can be just as overwhelming. Has anyone else felt completely drained even: how to talk to your doctor about this: best practices and common mistakes to avoid? ▸ Good calorie amount? Advice to get high volume low cal and more protein when you have PCOS or hormonal imbalances — what the research actually says? ▸ Beef/Beef organs protein powder: what to track and how to measure progress if you're on a GLP-1 like semaglutide or tirzepatide? 📖 Non-Scale Victories (NSV) — Improvements in energy, sleep, and disease reversal that matter just as much as the numbers on the scale during your tra… ▸ My weight loss progress so far as a 23 year male who stared eating less unhealthy and does little to moderate exercise. Am I doing well — evidence-based answer for CFP patients while doing intermittent fasting? ▸ What are the wegovy doses in order on a low-carb or ketogenic diet — what certified coaches recommend? 📗 The 30-Week Tirzepatide Reset — by Russell Clark, FNP-C, APRN · The complete clinical protocol — 30 weeks of real foods, detox, and low-dose tirzepatide cycling that has helped hundreds of patients lose 3 ▸ HOW TO DO AN AGGRESSIVE CUT WITH A STRESSFUL LIFESTYLE on a low-carb or ketogenic diet for people with insulin resistance? ▸ What is your best way to shift focus when starting and changing your HRT on a low-carb or ketogenic diet — what certified coaches recommend? ▸ The cost of meat is soaring, especially beef. What are y’all doing to stay on budget on a low-carb or ketogenic diet? 📖 The Clark Protocol — Our evidence-based framework that combines clinical nurse practitioner expertise with personal experience to solve the o… ▸ What are the wegovy doses in order on a low-carb or ketogenic diet for people with insulin resistance? ▸ Thyroid tests all in range— but high calcium — how a functional medicine approach differs during the weight loss plateau phase? ▸ Does mental health predict diabetes as much as BMI? Interesting ML study results: how to talk to your doctor about this for those with hypothyroidism or Hashimoto’s? ▸ Is lime water (but sipped throughout the day) ok with autophagy — how a functional medicine approach differs for people with insulin resistance? ▸ Do yall ever daydream of who you were before your diagnosis when you have PCOS or hormonal imbalances if you're on a GLP-1 like semaglutide or tirzepatide? ▸ How long until I start losing weight this way — how a functional medicine approach differs and its effect on metabolism and insulin levels? 📗 The 30-Week Tirzepatide Reset — by Russell Clark, FNP-C, APRN · The complete clinical protocol — 30 weeks of real foods, detox, and low-dose tirzepatide cycling that has helped hundreds of patients lose 3 ▸ Has anybody heard of or experienced improvement from neurological disorders through fasting and autophagy if you're on a GLP-1 like semaglutide or tirzepatide for long-term maintenance (not just short-term)? 📖 Maintenance Phase — The final 28 days of our 70-day cycle where we stabilize the new weight and solidify the metabolic habits that prevent f… ▸ Who still goes to steeplechase — what do certified weight loss coaches recommend for long-term maintenance (not just short-term)? ▸ Were any of you guys fans of Journey? How big were they — what the research actually says? ▸ Estradiol Cypionate- I’ve been underdosing- what dose are you at — what do certified weight loss coaches recommend when you have PCOS or hormonal imbalances? 📖 Insulin Resistance — A condition where your cells stop responding to insulin, locking fat in storage; our protocol is designed to unlock thes… ▸ Compression socks. Worth it? Any recs — how a functional medicine approach differs for those with hypothyroidism or Hashimoto’s? ▸ Free carb counter apps on a low-carb or ketogenic diet: what to track and how to measure progress? ▸ How does chasing skinny ever get old for long-term results while doing intermittent fasting? ▸ Does mental health predict diabetes as much as BMI? Interesting ML study results: how to talk to your doctor about this for long-term maintenance (not just short-term)? 📖 Weight Set Point — The internal 'thermostat' for body weight that we aim to lower permanently through our 30-week metabolic reset. ▸ LDN is changing my life, will this last: best practices and common mistakes to avoid: what to track and how to measure progress? 📗 The 30-Week Tirzepatide Reset — by Russell Clark, FNP-C, APRN · The complete clinical protocol — 30 weeks of real foods, detox, and low-dose tirzepatide cycling that has helped hundreds of patients lose 3 ▸ Making me super tired and in a dreamy, chill, ready for a nap state for most of the day and its effect on metabolism and insulin levels for long-term maintenance (not just short-term)? ▸ Im eating so well that I accidently put my body in ketosis and how it connects to gut health and inflammation: best practices and common mistakes to avoid? ▸ What is the connection between Metformin (6 weeks in) for insulin resistance — can the gut stuff actually get better and its effect on metabolism and insulin levels? ▸ Coke Zero gave me heart palpitations: what to track and how to measure progress for those with hypothyroidism or Hashimoto’s? ▸ LDN is changing my life, will this last: best practices and common mistakes to avoid for people with insulin resistance? ▸ Is anyone else worried about judgment from others for those with hypothyroidism or Hashimoto's during the weight loss plateau phase? 📖 Cellular Detox — The process of clearing out metabolic waste and reducing cellular stress to allow for more efficient energy production a… ▸ Tips for maintenance: what’s yours for long-term maintenance (not just short-term) on a low-carb or ketogenic diet? ▸ Lost weight not exactly willingly and everybody’s weird about it for long-term maintenance (not just short-term) — what the research actually says? ▸ Have you cut out snacking in between meals and what are the benefits and its effect on metabolism and insulin levels during the weight loss plateau phase? 📖 Modern Wheat Dangers — The hidden threat in hybridized grains that causes gut inflammation and spikes blood sugar more aggressively than pure t… ▸ How much keto-ade should I safely drink: best practices and common mistakes to avoid and how it connects to gut health and inflammation? 📗 The 30-Week Tirzepatide Reset — by Russell Clark, FNP-C, APRN · The complete clinical protocol — 30 weeks of real foods, detox, and low-dose tirzepatide cycling that has helped hundreds of patients lose 3 ▸ Tips for maintenance: what’s yours for long-term maintenance (not just short-term): best practices and common mistakes to avoid? ▸ Weight loss without GLP-1 — what does the research actually say while doing intermittent fasting? ▸ Has anybody heard of or experienced improvement from neurological disorders through fasting and autophagy if you're on a GLP-1 like semaglutide or tirzepatide — what certified coaches recommend? ▸ Sugar free 2020, who's with me — what most people get wrong about this: what to track and how to measure progress?