Expert Q&A

Does anyone have a normal A1C, but high insulin during the weight loss plateau phase

Understanding Normal A1C With Elevated Insulin

Many people in their mid-40s to mid-50s hit a frustrating weight loss plateau despite following structured plans. A common finding is a normal A1C (under 5.7%) yet fasting insulin above 10-15 μU/mL. This pattern signals early insulin resistance, where your pancreas produces excess insulin to keep blood sugar normal. In my book, The CFP Metabolic Reset, I explain how this hidden imbalance drives fat storage, especially around the midsection, making further loss feel impossible.

Hormonal changes during perimenopause and menopause amplify this. Declining estrogen reduces insulin sensitivity, while cortisol from chronic stress keeps insulin elevated. The result? Your body prioritizes storing energy as fat rather than burning it, even on a calorie deficit. This explains why standard diets fail you time after time.

Why This Happens During Plateaus

During a plateau, your metabolism adapts. After initial loss, the body downregulates thyroid hormones and upregulates hunger signals like ghrelin. High insulin prevents fat mobilization from adipocytes. Studies show individuals with normal A1C but insulin over 12 μU/mL have 40% lower rates of fat oxidation during exercise. Joint pain and limited mobility compound this by reducing daily movement, further slowing metabolic rate.

Diabetes management and blood pressure medications can also influence insulin dynamics. Beta-blockers or certain diuretics may subtly worsen resistance. The overwhelm from conflicting nutrition advice often leads to hidden carbs that spike insulin without raising glucose enough to show on A1C.

Practical Strategies to Break Through

Focus on insulin sensitivity rather than just calories. In the CFP approach, we use a 14:10 intermittent fasting window to lower baseline insulin by 30-50% within weeks. Prioritize 1.6g of protein per kg of ideal body weight daily from sources like eggs, fish, and Greek yogurt to stabilize blood sugar. Replace refined carbs with 30-40g fiber from non-starchy vegetables and berries to blunt insulin response.

Incorporate resistance training twice weekly, starting with seated or low-impact moves to accommodate joint pain—no gym membership needed. A simple 20-minute circuit of bodyweight squats, wall pushes, and resistance bands improves muscle glucose uptake, lowering insulin needs. Track fasting insulin every 8-12 weeks through affordable lab panels rather than relying solely on A1C.

Manage stress with 10-minute daily breathwork to reduce cortisol-driven insulin spikes. Supplements like berberine (500mg twice daily with meals) or inositol can support sensitivity without insurance-covered prescriptions. These steps address the root hormonal changes without complex meal plans.

Long-Term Success and Monitoring

Breaking the plateau requires patience—expect 4-8 weeks of consistent changes before the scale moves again. Once insulin drops below 8 μU/mL, fat loss typically resumes at 0.5-1 pound per week. The CFP method emphasizes sustainable habits over quick fixes, helping you rebuild trust in your body’s ability to lose weight despite past failures. Many clients report better energy, reduced joint discomfort, and easier blood pressure control as insulin normalizes.

Start small: get your fasting insulin tested this week and begin with one change—perhaps the fasting window. You’re not alone in this struggle, and these targeted shifts can finally move the needle.

💬 What the Community Says

The community shows a mix of relief and frustration around normal A1C but high insulin during weight loss stalls. Many in the 45-55 age group share stories of hitting plateaus after 15-20 pounds lost, only to discover fasting insulin levels between 12-25 μU/mL despite perfect A1C readings. A common theme is feeling gaslit by doctors who focus solely on glucose numbers and dismiss concerns. Most practitioners report success with lower-carb eating, strength training, and time-restricted eating, though joint pain often limits options. A vocal minority debates whether berberine or prescription metformin helps more. Insurance barriers and embarrassment about asking for advanced testing come up frequently. Lived experiences highlight that hormonal shifts in midlife make standard advice ineffective, leading many to seek functional health approaches. Overall sentiment leans hopeful once people understand the insulin connection, but skepticism remains high after repeated diet failures.
Cite this answer
Clark, R. (2026). Does anyone have a normal A1C, but high insulin during the weight loss plateau p. *CFP Weight Loss*. https://ask.cfpweightloss.com/ask/does-anyone-have-a-normal-a1c-but-high-insulin-during-the-weight-loss-plateau-phase
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.

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