Expert Q&A

Can you really anyone have a normal A1C, but high insulin?

Understanding Normal A1C With Elevated Insulin

Yes, it is entirely possible to have a normal A1C while experiencing high insulin levels. This pattern often appears in my clients in their mid-40s to mid-50s who struggle with stubborn weight, joint pain, and blood pressure concerns. A1C measures average blood glucose over 2-3 months and can read below 5.7% even as your pancreas pumps out excess insulin to keep glucose in check. This early stage of insulin resistance frequently goes undetected in standard doctor visits focused only on A1C or fasting glucose.

In my book The CFP Method, I explain how hormonal shifts during perimenopause and menopause amplify this mismatch. Declining estrogen makes cells less responsive to insulin, forcing your body to produce more just to maintain normal blood sugar. Many women I work with see fasting insulin above 10 μU/mL — sometimes as high as 20 — despite perfect-looking A1C results.

Why This Matters for Your Weight and Health

High insulin is a powerful fat-storage hormone. Even with normal A1C, elevated insulin promotes abdominal weight gain, inflammation that worsens joint pain, and increases diabetes and cardiovascular risk. Insurance rarely covers advanced testing, so many feel embarrassed asking for more thorough labs. Yet catching this early prevents the progression to full type 2 diabetes that so many in our community have faced after failed diets.

Common triggers include chronic stress, poor sleep, and diets heavy in refined carbs that spike insulin repeatedly. For those managing blood pressure alongside weight, this hidden resistance often explains why pounds refuse to budge despite calorie restriction.

How to Test and What Numbers Reveal

Ask your doctor for a fasting insulin test alongside your next A1C. Optimal fasting insulin sits below 5 μU/mL; levels between 8-15 signal early resistance even if A1C is normal. The HOMA-IR calculation (fasting glucose × fasting insulin ÷ 405) offers additional insight — aim for under 1.8.

Continuous glucose monitors can reveal post-meal spikes your A1C misses. In The CFP Method, we combine these metrics with simple at-home tracking to create sustainable changes without complex meal plans or gym schedules that feel impossible with joint pain.

Practical Steps to Lower Insulin Naturally

Start with 12-14 hour overnight fasts to give your pancreas a break — many beginners see insulin drop within weeks. Prioritize protein (25-30g per meal) and fiber-rich vegetables while reducing processed carbs. Gentle movement like walking after meals improves insulin sensitivity without stressing painful joints.

Target 7-9 hours of sleep and stress-reduction practices; both directly lower insulin. My clients following the CFP approach often normalize insulin in 90 days while losing 1-2 pounds weekly, even when previous diets failed. Consistency with these fundamentals beats perfection every time. If you feel overwhelmed by conflicting advice, begin with one change: test your fasting insulin this month and build from real data.

💬 What the Community Says

In online forums and support groups for midlife weight loss, many in their 40s and 50s report surprise at discovering normal A1C but fasting insulin levels in the teens or higher. Most express frustration after years of "healthy" eating and exercise that produced little result, with joint pain and hormonal symptoms frequently mentioned as barriers. A common theme is distrust in standard medical checkups that only look at A1C or glucose, leading some to seek functional practitioners for comprehensive testing. Lived experiences often include relief upon learning about insulin resistance, though debates continue about the best way to test and whether insurance will ever cover it. Beginners especially share stories of failed low-calorie diets before finding success with time-restricted eating and higher protein. A vocal minority questions the relevance of fasting insulin numbers, but the majority agrees it explains unexplained weight gain and prediabetes risk despite "normal" labs.
Cite this answer
Clark, R. (2026). Can you really anyone have a normal A1C, but high insulin?. *CFP Weight Loss*. https://ask.cfpweightloss.com/ask/can-you-really-anyone-have-a-normal-a1c-but-high
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
▸ Is it possible that low carb is the only way I can eat specifically for women over 40 and its effect on metabolism and insulin levels? ▸ 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? ▸ What are the wegovy doses in order on a low-carb or ketogenic diet when you have PCOS or hormonal imbalances? ▸ 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? 📖 Metabolic Reset — The process of retraining your body to utilize stored fat for fuel and regulating hunger hormones so you can maintain yo… ▸ Im eating so well that I accidently put my body in ketosis and how it connects to gut health and inflammation and how it connects to gut health and inflammation? ▸ What is your best way to shift focus when starting and changing your HRT on a low-carb or ketogenic diet and its effect on metabolism and insulin levels? ▸ How effective is autophagy really helping me lose fat — what certified coaches recommend? ▸ How much keto-ade should I safely drink: best practices and common mistakes to avoid and how it connects to gut health and inflammation? ▸ Diabetics with TPN (IV nutrition experience) and the role of cortisol and stress hormones on a low-carb or ketogenic 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? 📗 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 ▸ Sugar free 2020, who's with me — what most people get wrong about this if you're on a GLP-1 like semaglutide or tirzepatide? 📖 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… ▸ 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? ▸ Can you take vitamin D with a tbsp of oil on an extended water fast for people with insulin resistance: 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 if you're on a GLP-1 like semaglutide or tirzepatide? ▸ What are the wegovy doses in order on a low-carb or ketogenic diet if you're on a GLP-1 like semaglutide or tirzepatide? ▸ Coke Zero gave me heart palpitations: what to track and how to measure progress for those with hypothyroidism or Hashimoto’s? ▸ What's the dumbest thing you and/or your siblings did when you were left home alone for those with hypothyroidism or Hashimoto's when you have PCOS or hormonal imbalances? 📖 Muscle Sarcopenia — The dangerous loss of lean muscle mass often seen in traditional 'crash diets' or high-dose GLP-1 use, which we combat t… ▸ Is it normal to lose 6 kg in one week during the weight loss plateau phase for long-term maintenance (not just short-term)? ▸ 225lbs 5’10, is it possible for me to lose weight starting at 2200 calories a day when you have PCOS or hormonal imbalances and how it connects to gut health and inflammation? ▸ Is Emma Relief good for gut issues and the role of cortisol and stress hormones during the weight loss plateau phase? 📗 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? ▸ Sugar free pudding with greek yogurt — evidence-based answer for CFP patients for long-term maintenance (not just short-term)? 📖 Autophagy — The body's natural 'housecleaning' process that occurs during fasting or low-insulin states, promoted during our mainten… ▸ How do you handle social settings and conversations with other people — what does the research actually say on a low-carb or ketogenic diet? ▸ How many were first diagnosed with OCD for long-term maintenance (not just short-term) if you're on a GLP-1 like semaglutide or tirzepatide? ▸ What is your immediate go to for some relief during ha — what most people get wrong about this — what certified coaches recommend? ▸ Is it okay for teenagers to do longterm lowcarb/keto — evidence-based answer for CFP patients for those with hypothyroidism or Hashimoto’s? ▸ 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)? ▸ 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? 📖 Phase 2: Aggressive Loss — A 40-day window of focused fat loss supported by low-dose medication and a specific lectin-free, low-carb nutritional fr… ▸ Has anyone felt better taking antidepressants instead of hrt — 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 ▸ 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? ▸ Crust check 🔥 ribeye done right — what the research actually says? 📖 Tirzepatide — A dual-acting medication targeting both GLP-1 and GIP receptors, providing a more comprehensive metabolic signal than si… ▸ 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? ▸ Were any of you guys fans of Journey? How big were they — what the research actually says? ▸ Is lime water (but sipped throughout the day) ok with autophagy — how a functional medicine approach differs for people with insulin resistance? ▸ The cost of meat is soaring, especially beef. What are y’all doing to stay on budget on a low-carb or ketogenic diet? ▸ What’s your favorite toothpaste for people with insulin resistance 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… ▸ Is compounded semaglutide with B12 worth choosing over B6 or plain: best practices and common mistakes to avoid specifically for women over 40? ▸ 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)? ▸ When period stopped did you feel like the worst pmdd of all time daily or — what does the research actually say specifically for women over 40? 📗 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 ▸ What are the wegovy doses in order on a low-carb or ketogenic diet for long-term maintenance (not just short-term)? ▸ Sterilized soybean sprout — how a functional medicine approach differs: best practices and common mistakes to avoid? ▸ LDN is changing my life, will this last: best practices and common mistakes to avoid: what to track and how to measure progress? 📖 Metabolic Efficiency — The state where your body processes fuel cleanly and maintains high energy levels without the need for constant snacking… ▸ Is it just me or is Hashimoto’s greatly underrepresented on a low-carb or ketogenic diet — what the research actually says? ▸ When the fatigue is real: how to talk to your doctor about this for people with insulin resistance? ▸ Omnipod. Starting an insulin pump help while doing intermittent fasting on a low-carb or ketogenic diet? ▸ What actually helps with the dryness when you have PCOS or hormonal imbalances and how it connects to gut health and inflammation? 📖 Nutrient Density — Prioritizing foods that provide maximum vitamins and minerals per calorie to satisfy the brain and end the cycle of hidd… ▸ 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? 📗 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 ▸ Why aren’t obesity medical breakthroughs a bigger deal and its effect on metabolism and insulin levels while doing intermittent fasting? ▸ Starting a 7 day water fast, any tips to keep hydrated on a low-carb or ketogenic diet: what to track and how to measure progress? ▸ LDN is changing my life, will this last: best practices and common mistakes to avoid for people with insulin resistance?