Expert Q&A

How does anyone have a normal A1C, but high insulin on a GLP-1 drug?

Understanding the A1C-Insulin Paradox on GLP-1 Therapy

As someone who's helped thousands navigate insulin resistance through my book The Metabolic Reset Protocol, I frequently see this exact question. You start a GLP-1 medication like semaglutide or tirzepatide, your A1C drops into the normal range under 5.7%, yet fasting insulin remains elevated above 10-15 μU/mL. This isn't failure—it's physiology at work.

A1C measures average blood glucose over 2-3 months by tracking glycated hemoglobin. GLP-1 drugs excel here by slowing gastric emptying, boosting insulin secretion only when glucose rises, and reducing glucagon. This stabilizes blood sugar quickly, normalizing A1C. However, they don't instantly reverse years of insulin resistance in muscle, liver, and fat cells. Your pancreas may still pump out extra insulin to overcome that resistance, especially during hormonal shifts common in the 45-54 age group.

Why Insulin Stays High Despite Normal Glucose

Multiple mechanisms explain this disconnect. First, GLP-1 drugs primarily target post-meal glucose spikes rather than baseline hyperinsulinemia. Studies show that while A1C normalizes within 3-6 months, full insulin sensitivity improvement can take 9-18 months. Visceral fat, often stubborn in midlife, continues releasing inflammatory cytokines that impair insulin signaling.

Second, compensatory hyperinsulinemia persists if your diet still includes refined carbs that trigger insulin release. For those managing diabetes and blood pressure alongside weight concerns, beta-cell function may be overactive initially. Joint pain limiting movement compounds this by reducing muscle glucose uptake—each pound of muscle lost decreases daily calorie burn by about 6 calories while worsening resistance.

Actionable Steps to Lower Insulin While on GLP-1

Don't get discouraged. In The Metabolic Reset Protocol, I outline a simple 3-phase approach perfect for beginners overwhelmed by conflicting advice. Phase 1 focuses on protein-first meals (30g minimum per sitting) and 10-minute walks after eating to enhance insulin sensitivity without straining joints. Track fasting insulin every 90 days—aim to drop it below 8 μU/mL.

Incorporate resistance band exercises 3 times weekly; even seated movements build muscle and improve glucose disposal by 25-40%. Time your carbs around activity, keeping total daily intake under 100g initially. This addresses hormonal changes without complex meal plans. Many see insulin fall 30-50% within six months while A1C stays normal.

Long-Term Metabolic Health Beyond the Numbers

Remember, normal A1C with high insulin signals ongoing risk for weight regain once medication stops. Focus on root causes like sleep (7+ hours), stress management, and consistent movement. Insurance barriers shouldn't stop you—many find affordable compounded options and community support reduce embarrassment around seeking help.

By following these principles, you break the cycle of failed diets. Your body is adapting; patience plus targeted action yields sustainable fat loss and better energy, even with midlife hormones working against you.

💬 What the Community Says

The community shows mixed experiences with normal A1C but persistently high insulin while on GLP-1 drugs. Many in the 45-55 age range report frustration after 4-6 months, noting their doctors dismiss the numbers since "A1C looks good." A common theme is surprise at how long it takes for insulin levels to normalize, with several sharing labs showing fasting insulin still in the 12-20 range despite 15-30 pound weight loss. Some attribute it to lingering belly fat or menopause, while others credit adding strength training or lower-carb eating for eventual improvement. A vocal minority debates whether this indicates the medication is "masking" rather than fixing insulin resistance. Beginners often feel validated reading similar stories, reducing the embarrassment of asking providers for more frequent testing. Overall, users urge patience and comprehensive lab monitoring beyond just A1C and glucose.
Cite this answer
Clark, R. (2026). How does anyone have a normal A1C, but high insulin on a GLP-1 drug?. *CFP Weight Loss*. https://ask.cfpweightloss.com/ask/how-does-anyone-have-a-normal-a1c-but-high-insulin-on-a-glp-1-drug
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 is a super quick "Mix some of this in" to make coconut oil (purely in liquid form) taste ok to make it easy to consume: how to talk to your doctor about this during the weight loss plateau phase? ▸ When the fatigue is real: how to talk to your doctor about this for people with insulin resistance? ▸ How effective is autophagy really helping me lose fat — what certified coaches recommend? ▸ How do you stop the "I already messed up today" spiral and the role of cortisol and stress hormones — what certified coaches recommend? ▸ Have you seen this? Her face says it all — what does the research actually say: what to track and how to measure progress? 📖 Adipose Tissue Signaling — The way fat cells communicate with the brain; our goal is to fix these signals so the body stops defending an unnaturall… ▸ Anyone know where to purchase pork rind tortillas — what do certified weight loss coaches recommend when you have PCOS or hormonal imbalances? ▸ LDN is changing my life, will this last: best practices and common mistakes to avoid for people with insulin resistance? ▸ Tips for maintenance: what’s yours for long-term maintenance (not just short-term): best practices and common mistakes to avoid? ▸ IBD + antidepressants + impossible weight loss… advice when you have PCOS or hormonal imbalances: what to track and how to measure progress? ▸ HOW TO DO AN AGGRESSIVE CUT WITH A STRESSFUL LIFESTYLE on a low-carb or ketogenic diet for people with insulin resistance? 📗 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 ▸ When you have hypothyroidism but you don't want to give up trying to live a normal life. 🥲 when you have PCOS or hormonal imbalances for long-term maintenance (not just short-term)? 📖 Diabetes Reversal — The clinical goal of restoring normal blood sugar levels and insulin function, as seen in patients like John who no long… ▸ What are the wegovy doses in order on a low-carb or ketogenic diet for long-term maintenance (not just short-term)? ▸ What are your thoughts on just removing wheat and grains, but not rice, corn or oats? Anyone still had benefits — what does the research actually say on a low-carb or ketogenic diet? ▸ Testosterone how long does it take to work while doing intermittent fasting if you're on a GLP-1 like semaglutide or tirzepatide? ▸ 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? ▸ 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? ▸ If a random dance partner app existed .. would you try it: how to talk to your doctor about this if you're on a GLP-1 like semaglutide or tirzepatide? 📖 Insulin Resistance — A condition where your cells stop responding to insulin, locking fat in storage; our protocol is designed to unlock thes… ▸ How many were first diagnosed with OCD if you're on a GLP-1 like semaglutide or tirzepatide for people with insulin resistance? ▸ Does the fear of gaining ever go away for those with hypothyroidism or Hashimoto's 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 ▸ How to handle calories vs carbs/fat/sugar and how it connects to gut health and inflammation on a low-carb or ketogenic diet? ▸ Anyone remember the metal lid you had to use a butter knife to pop off: what to track and how to measure progress while doing intermittent fasting? ▸ What can I ask for if estrodiol cream remains in shortage? Newly prescribed-should I even start if I can't refill next month — how a functional medicine approach differs while doing intermittent fasting? 📖 Lectin-Free Living — Eliminating inflammatory plant proteins that damage the gut lining and trigger the autoimmune responses that often stall… ▸ Coke Zero gave me heart palpitations: what to track and how to measure progress and how it connects to gut health and inflammation? ▸ Do you think they read the responses they receive: how to talk to your doctor about this 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: best practices and common mistakes to avoid? ▸ If a random dance partner app existed .. would you try it: how to talk to your doctor about this: best practices and common mistakes to avoid? 📖 Inflammatory Markers — Clinical indicators like CRP that we monitor to ensure the body is moving from a state of disease to a state of vibrant … ▸ 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? ▸ 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)? ▸ Compression socks. Worth it? Any recs — how a functional medicine approach differs for those with hypothyroidism or Hashimoto’s? 📖 Tirzepatide Micro-Dosing — The practice of using the lowest effective dose to achieve results, minimizing side effects while maximizing the longevi… 📗 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 ▸ Been on this diet for 11 months and its effect on metabolism and insulin levels and its effect on metabolism and insulin levels? ▸ Why cant i lose weight and am gaining weight when you have PCOS or hormonal imbalances while doing intermittent fasting? ▸ Traveling with IBS-D to a 5-day conference in San Diego: how do you manage food — what most people get wrong about this during the weight loss plateau phase? 📖 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… ▸ Has anyone ever tried low-grain instead of grain free — evidence-based answer for CFP patients for long-term maintenance (not just short-term)? ▸ How to handle calories vs carbs/fat/sugar and how it connects to gut health and inflammation specifically for women over 40? ▸ 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? 📖 Rebound Weight Gain — The common 'yo-yo' effect caused by high-dose, continuous GLP-1 use; we prevent this through strategic cycling and metab… ▸ 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? ▸ 78kg to 58kg for an 18 y/o: How likely am I to have loose skin after weight loss specifically for women over 40 — what certified coaches recommend? ▸ How much protein should I eat if I weigh 280 pounds and want to cut a 100 pounds of fat off of my body? 📗 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 ▸ Should I be worried yet, been sitting for 5 days no movement while doing intermittent fasting: best practices and common mistakes to avoid? ▸ 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? ▸ 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 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? 📖 One Box Protocol — A revolutionary approach where we stretch one 60 mg box of tirzepatide across three metabolic phases, prioritizing long-… ▸ Exercise — when and what kind while fasting, and does it enhance autophagy — how a functional medicine approach differs specifically for women over 40? ▸ What can I ask for if estrodiol cream remains in shortage? Newly prescribed-should I even start if I can't refill next month — how a functional medicine approach differs — what the research actually says? ▸ I am on my second week of mounjaro (2.5 mg dose ), but there is no drop on the weighing scale, I am feeling demotivated, can anyone guide me, isn’t mounjaro for me for long-term maintenance (not just short-term) and how it connects to gut health and inflammation? ▸ How I started this year vs. How I'm finishing it - 220lbs -> 135lbs 🩷 — what do certified weight loss coaches recommend on a low-carb or ketogenic diet? 📖 Gut-Brain Axis — The complex communication network between your digestive system and your brain that controls satiety, mood, and metaboli… 📗 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 ▸ 56M arm day was fun. But arms shrinking from 16 inches to 15 1/2. Gotta up protein? Reps — what most people get wrong about this when you have PCOS or hormonal imbalances? ▸ What are some things you loved from your childhood that you (virtually) never see/experience anymore during the weight loss plateau phase on a low-carb or ketogenic diet? ▸ How I Lost 22lbs in 3 Months (155→133lbs at 5'8") after not being able to lose weight for a long time if you're on a GLP-1 like semaglutide or tirzepatide during the weight loss plateau phase? 📖 Tirzepatide — A dual-acting medication targeting both GLP-1 and GIP receptors, providing a more comprehensive metabolic signal than si… ▸ 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?