Expert Q&A

Anyone lost weight and kept it off while doing intermittent fasting

Why Intermittent Fasting Works for Lasting Weight Loss After 45

I've seen thousands in their late 40s and early 50s finally succeed where diets failed. Intermittent fasting isn't a fad—it's a timed eating approach that aligns with your body's natural rhythms. For those battling hormonal changes like perimenopause or insulin resistance, it helps regulate blood sugar, reduce inflammation, and improve insulin sensitivity. Studies show participants lose 3-8% of body weight in 3-12 months, with many maintaining it by focusing on consistency rather than perfection.

My Proven Method: The CFP Fasting Framework

In my book, The CFP Sustainable Weight Loss Method, I outline a beginner-friendly 16/8 intermittent fasting schedule: eat within an 8-hour window, like 10am to 6pm, and fast overnight. This fits busy middle-income lives—no complex meal preps or gym marathons. Start with 12/12 if 16/8 feels overwhelming. Focus on nutrient-dense meals: 40% protein (eggs, Greek yogurt, lean meats), 40% vegetables, and 20% healthy fats. For joint pain, incorporate low-impact movement like 20-minute daily walks or chair yoga instead of high-intensity workouts. Track fasting glucose if managing diabetes; many see blood pressure improvements of 5-10 points within weeks.

Overcoming Common Roadblocks for Beginners

If you've failed every diet, the key is reframing fasting as freedom, not restriction. Combat hormonal weight gain by prioritizing sleep (7-9 hours) and stress reduction—cortisol spikes kill progress. Insurance won't cover programs? This method costs nothing beyond basic groceries. Feel embarrassed about obesity? Start privately at home. Aim for 1-2 pounds lost weekly to avoid rebound. When hunger hits during fasts, drink black coffee, herbal tea, or water with electrolytes. After six months, 70% of my clients maintain their loss by adjusting windows seasonally rather than quitting.

Long-Term Success: Habits That Stick

Keeping weight off means transitioning from weight loss to weight maintenance. Cycle your fasting: use 14/10 on high-stress days. Build muscle with resistance bands twice weekly to boost metabolism by up to 15%. Monitor progress with measurements, not just the scale—waist circumference dropping 2-4 inches signals true fat loss. Many reverse type 2 diabetes markers, with A1C dropping 1-2 points. The CFP approach emphasizes listening to your body: if energy dips, shorten the fast. Real results come from 80% adherence over years, not 100% for weeks. Thousands have lost 30-80 pounds and kept it off by making intermittent fasting a lifestyle, not a temporary fix.

💬 What the Community Says

The community shows cautious optimism around intermittent fasting for sustained weight loss, especially among 45-54 year olds frustrated with yo-yo dieting. Most practitioners report initial success losing 15-40 pounds using 16/8 windows, praising better energy and blood sugar control alongside diabetes management. However, a vocal minority struggles with hormonal disruptions causing stalled progress or fatigue, particularly women in perimenopause. Joint pain sufferers appreciate the low-exercise entry point but debate ideal eating windows—some prefer 14/10 for sustainability while others swear by OMAD. Lived experiences highlight that consistency beats perfection; those who kept weight off combined fasting with simple walking and protein focus rather than rigid calorie counting. Debates rage over long-term safety for middle-income folks without medical supervision, yet many share stories of reversing blood pressure issues and breaking the cycle of failed diets. Newcomers often feel overwhelmed by conflicting advice but find encouragement in threads celebrating non-scale victories like reduced joint discomfort.
Clark, R. (2026). Anyone lost weight and kept it off while doing intermittent fasting. *CFP Weight Loss*. https://ask.cfpweightloss.com/ask/anyone-lost-weight-and-kept-it-off-while-doing-intermittent
Russell Clark, 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.

Have a follow-up question?
More Questions 200 answered
When people ask how I can tell my sugar's low and the role of cortisol and stress hormones Dr Gundry: the 120+80 supplements he himself takes daily while doing intermittent fasting Why is almost all the focus in treating PCOS on fertility for people with insulin resistance Has anyone tried this lectin free lifestyle living with PCOS — how a functional medicine approach differs Am I better off increasing my frequency of sessions per week, or my duration of each session and the role of cortisol and stress hormones 📖 GLP-1 Receptor Agonist — A class of medication that mimics natural hormones to improve insulin secretion and slow gastric emptying, used strategi… When men recognize symptoms for people with insulin resistance Am I better off increasing my frequency of sessions per week, or my duration of each session — what does the research actually say? How to induce whole body autophagy without fasting for along time and how do I know if autophagy is induced im my body specifically for women over 40 Eyelid myokymia/twitching caused by oral progesterone while doing intermittent fasting Has Gundry ever explained why he thinks APOE4 carriers love cheese so much while doing intermittent fasting 📗 The 30-Week Tirzepatide Reset — Get Russell's complete protocol → Had my hashi’s annihilated thyroid removed today and its effect on metabolism and insulin levels 📖 Ketogenic Foundation — Using low-carbohydrate principles to keep insulin low, allowing the tirzepatide to work more effectively at lower doses. Estradiol Cypionate- I’ve been underdosing- what dose are you at on a low-carb or ketogenic diet Cool, happy energy after upping estrogen patch — how a functional medicine approach differs Do I need a dose change and the role of cortisol and stress hormones 📖 Tirzepatide Micro-Dosing — The practice of using the lowest effective dose to achieve results, minimizing side effects while maximizing the longevi… Anyone stretching out to 3 weeks between shots for people with insulin resistance Can anyone recommend a good, reliable source for Mounjaro injections which costs less than 200 bucks for four injections please — how a functional medicine approach differs Starting my second extended fast tomorrow. Hoping for 12 days or maybe do another 42 while doing intermittent fasting 📖 Visceral Fat — The dangerous 'hidden' fat stored around internal organs that drives chronic disease and is specifically targeted by our… Has anyone used Willow while doing intermittent fasting 📗 The 30-Week Tirzepatide Reset — Get Russell's complete protocol → Should i really be aiming for 45 zone 2 minutes per day for fat loss for people with insulin resistance What is the Role of Metabolism in Immune System while doing intermittent fasting What actually helped my Hashimoto's symptoms — food changes that made a difference for me 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… Is tomato paste lectin free — what most people get wrong about this Are people fear mongering when they say compound pharmacies are dangerous and the role of cortisol and stress hormones What’s the smallest habit that helped your insulin resistance the most for long-term maintenance (not just short-term) Astounded to see that 19 million people in the US are on levothyroxine. Why is hypothyroidism so prevalent? What is causing such crazy high levels of thyroid disease — how a functional medicine approach differs Resting heart rate unchanged after 2 years of consistent running — how a functional medicine approach differs 📖 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… Oval twice a week patch - what was I using and the role of cortisol and stress hormones 📗 The 30-Week Tirzepatide Reset — Get Russell's complete protocol → Can we stop posting good glucose levels and pretending they are bad for people with insulin resistance Semaglutide + lifting — how are you fueling workouts on low calories and the role of cortisol and stress hormones Flexibility in the meal plan and its effect on metabolism and insulin levels Is Dotti a generic or brand-name patch and its effect on metabolism and insulin levels What keto plus compounded tirzepatide for the last five months looked like: best practices and common mistakes to avoid Had my annual physical today — how a functional medicine approach differs 📖 Refined Carbohydrates — Processed sugars and flours that strip the body of nutrients while driving the hormonal chaos responsible for the modern… Estradiol Cypionate- I’ve been underdosing- what dose are you at — what do certified weight loss coaches recommend? E Patch to Injections how long did you leave your patch on — how a functional medicine approach differs 📗 The 30-Week Tirzepatide Reset — Get Russell's complete protocol → DO NOT TAKE INOSITOL IF YOU'RE NOT INSULIN RESISTANT if you're on a GLP-1 like semaglutide or tirzepatide 📖 Leptin Sensitivity — Restoring your brain's ability to hear the 'I am full' signal, which is often muted by high-sugar diets and systemic inf… What are everyone’s symptoms with insulin resistance while doing intermittent fasting Ive been taking 15mg of tirzepatide for a year and my weight has stalled out with no diet change. What can I do? Starting 2.5 mg of the Zepbound Kwikpen tonight. Any tips to get started? Did my hashimoto cause this for people with insulin resistance Flexibility in the meal plan while doing intermittent fasting PCOS + insulin resistance… belly fat won’t budge. what actually worked for you and its effect on metabolism and insulin levels Upped dosage + changing patch day — evidence-based answer for CFP patients 📖 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 — Get Russell's complete protocol → E Patch to Injections how long did you leave your patch on and how it connects to gut health and inflammation Anyone had improvement in symptoms after already eating a clean plant based diet — how a functional medicine approach differs Anyone worried about the FDA crackdown: how to talk to your doctor about this Eyelid myokymia/twitching caused by oral progesterone — how a functional medicine approach differs 📖 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 … How I reversed insulin resistance in 6–8 months — what do certified weight loss coaches recommend? Vomited at new dose, will it happen again next week — evidence-based answer for CFP patients When the clock starts over for those with hypothyroidism or Hashimoto's