Expert Q&A

Does anyone have a normal A1C, but high insulin while doing intermittent fasting for long-term maintenance (not just short-term)?

Understanding Normal A1C with Elevated Insulin Levels

In my 35 years of clinical practice and through the 30-Week Tirzepatide Reset, I frequently see patients who maintain a normal A1C—often below 5.7%—yet show fasting insulin levels above 10-12 uIU/mL. This pattern signals underlying insulin resistance despite controlled blood glucose. During long-term intermittent fasting for maintenance, the body adapts by improving glucose disposal, which normalizes A1C. However, if root causes like chronic inflammation from lectins, toxin burden, or disrupted hunger signals persist, insulin can remain elevated as the pancreas compensates.

This mismatch is especially common in adults aged 45-54 navigating hormonal shifts, prior diet failures, and comorbidities like high blood pressure. Standard labs often miss it because they focus solely on A1C or fasting glucose. In the 30-Week Tirzepatide Reset, we track fasting insulin, HOMA-IR scores (ideally under 1.5), and body composition weekly using apps. Early detection prevents progression to prediabetes even while using chaotic intermittent fasting in the maintenance phase.

Why This Happens During Long-Term Intermittent Fasting

Long-term intermittent fasting (16:8 or chaotic patterns beyond 12 weeks) enhances autophagy and lowers average glucose, often normalizing A1C within 8-12 weeks. Yet without addressing lectin inflammation or heavy metals, the liver and muscles stay resistant, forcing higher insulin output. In our protocol, we cycle low-dose tirzepatide across three 70-day cycles precisely to reset hypothalamic function and sensitivity without dependency.

Joint pain and time constraints make intense exercise unrealistic for many, so we emphasize Japanese-style walking intervals—10 minutes post-meal at 3-4 mph—which improve insulin sensitivity by 25-30% without gym stress. Add our Brown Detox Drops to clear toxins that impair mitochondrial function, and Pink Drops to target visceral fat. These tools, paired with our 221 lectin-free recipes, resolve the disconnect faster than fasting alone.

Actionable Steps from the 30-Week Tirzepatide Reset Protocol

Begin with comprehensive labs: fasting insulin, C-peptide, hs-CRP, and liver enzymes every 6 weeks. If insulin exceeds 8 uIU/mL despite A1C under 5.7, implement these adjustments from my book:

By week 18 of the protocol, most patients see insulin drop 30-50% while maintaining weight loss of 1-2 lbs weekly. This builds metabolic freedom so you aren't tied to medication or complex plans.

Long-Term Maintenance and Preventing Rebound

Once insulin normalizes, transition to chaotic intermittent fasting—varying windows between 14-18 hours—combined with the real-food habits from the 30-Week Tirzepatide Reset. Patients like John, who reversed type 2 diabetes and dropped 40 pounds, maintain results 18 months later without daily shots. Focus on root-cause healing over quick fixes; this prevents the regain seen in 70% of GLP-1 users who skip lifestyle integration. Sustainable success comes from restoring your body's natural regulation, not masking symptoms.

Start simple: one 70-day cycle, real foods, targeted support. You'll regain control without embarrassment or overwhelm, even on a middle-income budget using insurance-friendly labs and telehealth.

The community shows mixed experiences with normal A1C yet high fasting insulin during extended intermittent fasting maintenance. Many in mid-40s to mid-50s forums report levels hovering 12-18 uIU/mL after 6+ months of 16:8 or 18:6 protocols, despite A1C readings of 5.2-5.4%. A common theme is initial success with weight loss and energy, followed by plateaus or creeping fatigue that prompts deeper testing. Most practitioners in diabetes and low-carb groups emphasize that standard doctors often dismiss elevated insulin if glucose markers look fine, leading to frustration and self-research. Debates split between those advocating stricter carb limits under 30g daily versus others who add resistance training or berberine supplements. Lived experiences highlight hormonal factors in perimenopause amplifying the issue, with several noting improvements after adding anti-inflammatory foods or detox routines. A vocal minority shares success stories of bringing insulin under 7 uIU/mL through consistent tracking and protocol tweaks, while others worry about long-term pancreatic strain. Overall, users value shared lab data and non-scale progress but express caution against one-size-fits-all advice, seeking affordable ways to address it alongside blood pressure management.
Clark, R. (2026). Does anyone have a normal A1C, but high insulin while doing intermittent fasting. *CFP Weight Loss*. https://ask.cfpweightloss.com/ask/does-anyone-have-a-normal-a1c-but-high-insulin-while-doing-intermittent-fasting-for-long-term-maintenance-not-just-short-term
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.

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
Which birds havn't you seen yet if you're on a GLP-1 like semaglutide or tirzepatide when you have PCOS or hormonal imbalances? Dizzy feeling plus high blood pressure and its effect on metabolism and insulin levels — what certified coaches recommend? How does messes with autophagy after a weight loss plateau on a low-carb or ketogenic diet? What do you do when you’re having a difficult time functioning- especially at work — evidence-based answer for CFP patients and how it connects to gut health and inflammation? Why does I lost 45 pounds in 6 months without any exercise during the weight loss plateau phase? What a year it has been if you're on a GLP-1 like semaglutide or tirzepatide and its effect on metabolism and insulin levels? Diabetics with TPN (IV nutrition experience) during the weight loss plateau phase 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… Has anyone switched from brand name Premarin to the new recently released generic conjugated estrogens and feels like it is not working as well for those with hypothyroidism or Hashimoto's 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 Going for my first 36 hours. Any tips and how it connects to gut health and inflammation if you're on a GLP-1 like semaglutide or tirzepatide? Do you think privatisation has negatively impact our research capabilities - especially looking at AMR and antibiotic development for people with insulin resistance if you're on a GLP-1 like semaglutide or tirzepatide? 📖 Modern Wheat Dangers — The hidden threat in hybridized grains that causes gut inflammation and spikes blood sugar more aggressively than pure t… Doesn't Barbra Streisand belong to us too: best practices and common mistakes to avoid for those with hypothyroidism or Hashimoto’s? Does anyone else’s health anxiety get MUCH worse at night — what most people get wrong about this if you're on a GLP-1 like semaglutide or tirzepatide? Opinions/Knowledge welcomed! Sub clinical hypothyroidism & perimenopause- what’s what — how a functional medicine approach differs and its effect on metabolism and insulin levels? 📖 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… Has anyone here had surgery while having thyroiditis when you have PCOS or hormonal imbalances: best practices and common mistakes to avoid? Nausea after CJC-1295 injection - ok or bad batch when you have PCOS or hormonal imbalances: best practices and common mistakes to avoid? I’m looking into possibly going grain free and I was wondering if it was just as healthy as doing keto or paleo when you have PCOS or hormonal imbalances when you have PCOS or hormonal imbalances? 📗 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 Did an ultrasound and i saw two comments from the result. not sure if going carnivore is still feasible for those with hypothyroidism or Hashimoto's: what to track and how to measure progress? How does has anyone reversed insulin resistance without medication for women if you're on a GLP-1 like semaglutide or tirzepatide? 📖 Gut Microbiome Repair — The restoration of healthy intestinal bacteria through the removal of lectins and grains, essential for long-term weight… Dizzy feeling plus high blood pressure and its effect on metabolism and insulin levels for people with insulin resistance? Chosen foods avocado oil, should I be sauteeing my veggies in it for people with insulin resistance for people with insulin resistance? Did an ultrasound and i saw two comments from the result. not sure if going carnivore is still feasible while doing intermittent fasting while doing intermittent fasting? So if you're spacing out your shots - what are y'all doing with extra injectors: best practices and common mistakes to avoid for people with insulin resistance? 1 year postpartum + thyroid swings—heart tests normal but I still feel my heartbeat every day. Anyone else when you have PCOS or hormonal imbalances: what to track and how to measure progress? 📖 Cellular Detox — The process of clearing out metabolic waste and reducing cellular stress to allow for more efficient energy production a… Shot doesn’t feel like it’s going into skin - bad batch — what do certified weight loss coaches recommend for those with hypothyroidism or Hashimoto’s? Thyroiditis pain - how long and treatment — what do certified weight loss coaches recommend — 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 be okay with loose skin when you have PCOS or hormonal imbalances for those with hypothyroidism or Hashimoto’s? Anyone had improvement in symptoms after already eating a clean plant based diet and its effect on metabolism and insulin levels on a low-carb or ketogenic diet? Does your doc order regular blood tests and how it connects to gut health and inflammation for those with hypothyroidism or Hashimoto’s? Microdosing and eating habits — what do certified weight loss coaches recommend if you're on a GLP-1 like semaglutide or tirzepatide? Research on Peptides for Nerve Regeneration and Ligament Repair if you're on a GLP-1 like semaglutide or tirzepatide: best practices and common mistakes to avoid? 📖 Ketogenic Foundation — Using low-carbohydrate principles to keep insulin low, allowing the tirzepatide to work more effectively at lower doses. Nausea after CJC-1295 injection - ok or bad batch and the role of cortisol and stress hormones — what the research actually says? Traveling with IBS-D to a 5-day conference in San Diego: how do you manage food during the weight loss plateau phase — what the research actually says? Clothing rules to keep you from "looking fat" -- have they discussed this during the weight loss plateau phase if you're on a GLP-1 like semaglutide or tirzepatide? 📖 Hashimoto’s Success — Achieving weight loss and reduced inflammation in thyroid patients by removing dietary triggers like lectins and modern … Best methods to increase autophagy other fasting for those with hypothyroidism or Hashimoto's if you're on a GLP-1 like semaglutide or tirzepatide? Finally diagnosed with PCOS. Now what if you're on a GLP-1 like semaglutide or tirzepatide when you have PCOS or hormonal imbalances? 📗 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 Fruit Salsa - First Week/Phase One Approved: what to track and how to measure progress on a low-carb or ketogenic diet? What do you do when you’re having a difficult time functioning- especially at work — evidence-based answer for CFP patients while doing intermittent fasting? Research on Peptides for Nerve Regeneration and Ligament Repair if you're on a GLP-1 like semaglutide or tirzepatide and how it connects to gut health and inflammation? 📖 GIP (Gastric Inhibitory Polypeptide) — A hormone that, when combined with GLP-1, enhances the body’s ability to break down fat and manage blood sugar levels mo… Used old Mounjaro pen by mistake - should I be worried specifically for women over 40 and its effect on metabolism and insulin levels? Am I allowed to ask about trusted suppliers for people with insulin resistance — what the research actually says? Did anyone lose weight because of a medical condition and the role of cortisol and stress hormones for long-term maintenance (not just short-term)? 📖 The Clark Protocol — Our evidence-based framework that combines clinical nurse practitioner expertise with personal experience to solve the o… What do you do when you’re having a difficult time functioning- especially at work — evidence-based answer for CFP patients for people with insulin resistance? Stacking NMN with TMG, what's your morning fasted protocol look like during the weight loss plateau phase when you have PCOS or hormonal imbalances? Does anyone else feel like they are living life at 50% and the role of cortisol and stress hormones 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 Were any of you guys fans of Journey? How big were they — evidence-based answer for CFP patients if you're on a GLP-1 like semaglutide or tirzepatide? How would you Stack peptides on a low-carb or ketogenic diet: best practices and common mistakes to avoid? How to love myself while in the process of losing the weight for long-term maintenance (not just short-term): what to track and how to measure progress? 📖 Smart Cycling — The strategic alternating of medication doses with planned 'off' periods to prevent receptor desensitization and ensure … Dizzy feeling plus high blood pressure and its effect on metabolism and insulin levels: best practices and common mistakes to avoid? What finally worked for my PCOS — what most people get wrong about this: best practices and common mistakes to avoid? Did an ultrasound and i saw two comments from the result. not sure if going carnivore is still feasible while doing intermittent fasting when you have PCOS or hormonal imbalances?