Expert Q&A

Normal insulin blood test but told i have IR — how a functional medicine approach differs while doing intermittent fasting?

Why Normal Labs Can Still Mean Insulin Resistance

Many patients in their late 40s and early 50s come to me with a normal fasting insulin blood test yet receive an insulin resistance (IR) diagnosis. Standard labs often miss early or compensated IR because they don’t measure how your cells respond under real-world stress. Fasting insulin can read 8–12 uIU/mL while post-meal spikes or HOMA-IR calculations reveal the problem. Hormonal changes, lectin-driven gut inflammation, and accumulated toxins keep your pancreas working overtime even when morning numbers look fine. This mismatch explains why past diets failed and why joint pain plus stubborn weight persist despite “normal” results.

How the Functional Medicine Lens Differs

Unlike conventional care that waits for A1C to rise, the functional medicine approach in my book The 30-Week Tirzepatide Reset looks at root drivers: lectin inflammation from grains and nightshades, liver and gut toxin burden, disrupted hunger signaling in the hypothalamus, and mitochondrial inefficiency. We track not just labs but body-composition scans, continuous glucose data, energy levels, joint comfort, and sleep quality. The 69 Transformation Steps give you a clear daily roadmap that rebuilds metabolic freedom instead of masking symptoms with medication alone. Low-dose tirzepatide cycling is used strategically for 70-day cycles to lower inflammation and restore sensitivity while real food and targeted support do the heavy lifting.

Integrating Intermittent Fasting Safely

Intermittent fasting (IF) becomes powerful once inflammation is reduced. Beginners often struggle with IF because high lectin intake and toxin load keep cortisol elevated and hunger hormones chaotic. In our protocol we start with a lectin-free low-carb plan built on 221 tested recipes that stabilize blood sugar first. Japanese-style walking intervals and red light therapy improve mitochondrial function so cells can handle longer fasting windows without crashing. We pair this with our Brown Detox Drops to bind and eliminate stored toxins that otherwise impair insulin signaling. Chaotic IF in the maintenance phase—varying 16:8, 18:6, or one-meal days—prevents adaptation and keeps metabolism flexible. Most patients notice joint pain easing within three weeks and report stable energy even during 17-hour fasts.

Real Results and What to Track

Patients like John, who started with an A1C of 7.8 and “normal” fasting insulin, dropped 40 pounds and normalized labs by week 30 using this exact system. Focus on non-scale victories: reduced joint pain, smaller waist, better blood pressure, and clothing sizes. Insurance rarely covers functional programs, so we designed the protocol for middle-income budgets—one box of tirzepatide, simple real-food meals, and affordable drops. If you feel overwhelmed by conflicting advice or embarrassed to seek help, know this protocol was built for people exactly like you. Metabolic freedom is achievable when you stop chasing quick fixes and address the real obstacles.

💬 What the Community Says

People in midlife forums frequently share frustration after receiving an insulin resistance diagnosis despite normal fasting insulin or A1C. Many describe years of failed low-fat or calorie-counting diets that worsened joint pain and fatigue. A common theme is distrust of standard lab ranges; users report feeling dismissed by primary doctors yet finding relief through functional practitioners who test inflammatory markers, fasting glucose-insulin ratios, or CGM patterns. Intermittent fasting sparks lively debate—some praise 16:8 for steady energy after removing grains, while others warn of cortisol spikes and stalled loss until detox and walking were added. Success stories often highlight 25–45 pound losses paired with medication cycling, red-light use, and lectin-free meals, though a vocal minority struggles with adherence due to busy schedules or social eating. Overall sentiment leans positive toward integrated protocols that address root causes rather than medication dependency alone, with many seeking telehealth options since local insurance rarely covers comprehensive plans.
Clark, R. (2026). Normal insulin blood test but told i have IR — how a functional medicine approac. *CFP Weight Loss*. https://ask.cfpweightloss.com/ask/normal-insulin-blood-test-but-told-i-have-ir-how-a-functional-medicine-approach-differs-while-doing-intermittent-fasting
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
▸ 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? ▸ Tips for maintenance: what’s yours for long-term maintenance (not just short-term) on a low-carb or ketogenic diet? ▸ 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? 📖 GLP-1 Receptor Agonist — A class of medication that mimics natural hormones to improve insulin secretion and slow gastric emptying, used strategi… ▸ How are people using 10mg reta vials at low doses during the weight loss plateau phase — what the research actually says? ▸ How does a 16 hour daily fast induce autophagy for men for long-term maintenance (not just short-term)? ▸ 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? ▸ If a random dance partner app existed .. would you try it: how to talk to your doctor about this and its effect on metabolism and insulin levels? ▸ 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? ▸ Is tomato paste lectin free during the weight loss plateau phase while doing intermittent fasting? ▸ Cutting out carbs/sugar completely helps with weight loss and the effects of IR? Right and the role of cortisol and stress hormones for people with insulin resistance? 📖 Diabetes Reversal — The clinical goal of restoring normal blood sugar levels and insulin function, as seen in patients like John who no long… 📗 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 do you deal with traveling when you're on a peptide protocol specifically for women over 40 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? ▸ 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? ▸ Is the carnivore diet the best WOE to lose weight — what does the research actually say 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… ▸ I have an iodine deficiency. Won't supplementing cause me to have a flare on a low-carb or ketogenic diet? ▸ Do yall ever daydream of who you were before your diagnosis when you have PCOS or hormonal imbalances when you have PCOS or hormonal imbalances? ▸ 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? ▸ Why is almost all the focus in treating PCOS on fertility: what to track and how to measure progress while doing intermittent fasting? 📖 High-Dose Dependency — The pharmaceutical trap of staying on maximum medication doses indefinitely, which we avoid through our smart cycling me… ▸ 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? ▸ 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 ▸ Thyroid tests all in range— but high calcium — how a functional medicine approach differs during the weight loss plateau phase? ▸ Sugar free 2020, who's with me — what most people get wrong about this: what to track and how to measure progress? ▸ 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? ▸ Omnipod. Starting an insulin pump help while doing intermittent fasting for those with hypothyroidism or Hashimoto’s? 📖 Hormonal Chaos — The internal state of imbalance caused by modern grains and refined carbs that overrides willpower and forces the body t… ▸ How effective is autophagy really helping me lose fat — what certified coaches recommend? ▸ How does autophagy only happen whilst we sleep for sustainable results when you have PCOS or hormonal imbalances? ▸ 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? ▸ 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? ▸ Omnipod. Starting an insulin pump help while doing intermittent fasting for long-term maintenance (not just short-term)? 📖 Lectin-Free Living — Eliminating inflammatory plant proteins that damage the gut lining and trigger the autoimmune responses that often stall… 📗 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 ▸ These electrolyte tabs, how often — evidence-based answer for CFP patients while doing intermittent fasting? ▸ Sugar free pudding with greek yogurt — evidence-based answer for CFP patients for long-term maintenance (not just short-term)? ▸ 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? 📖 Metabolic Flexibility — The body’s ability to efficiently switch between burning carbohydrates and burning stored body fat based on availability… ▸ What is the connection between Metformin (6 weeks in) for insulin resistance — can the gut stuff actually get better and how it connects to gut health and inflammation? ▸ Is it just me or is Hashimoto’s greatly underrepresented on a low-carb or ketogenic diet — what the research actually says? ▸ Do you think they read the responses they receive: how to talk to your doctor about this while doing intermittent fasting? ▸ 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? ▸ Low TSH, Low T4, and Low T3 simultaneously on Levothyroxine — anyone experienced this and the role of cortisol and stress hormones on a low-carb or ketogenic diet? 📖 Phase 1: Priming — The first 48 hours of a 70-day cycle focused on high-fat intake to prevent the brain from triggering a starvation respon… 📗 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 ▸ Can you really Metformin (6 weeks in) for insulin resistance — can the gut stuff actually get better specifically for women over 40? ▸ Crust check 🔥 ribeye done right for long-term maintenance (not just short-term)? ▸ Got diagnosed today, where do i go from here — what do certified weight loss coaches recommend: best practices and common mistakes to avoid? ▸ 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)? ▸ Exercise — when and what kind while fasting, and does it enhance autophagy — how a functional medicine approach differs specifically for women over 40? ▸ 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? 📖 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… ▸ 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? ▸ When the fatigue is real: how to talk to your doctor about this for people with insulin resistance? ▸ How does chasing skinny ever get old for long-term results while doing intermittent fasting? 📗 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? ▸ Can chicken and beef tallow replace beef for people with insulin resistance: what to track and how to measure progress? ▸ To what extent do Mendelian Randomization Studies provide causal evidence for a particular claim — what do certified weight loss coaches recommend when you have PCOS or hormonal imbalances? 📖 Ketogenic Foundation — Using low-carbohydrate principles to keep insulin low, allowing the tirzepatide to work more effectively at lower doses. ▸ Diabetics with TPN (IV nutrition experience) and the role of cortisol and stress hormones on a low-carb or ketogenic diet?