Expert Q&A

Endurance runners, how do you fuel during long runs during the weight loss plateau phase

Understanding the Weight Loss Plateau in Runners

As an expert at CFP Weight Loss, I've worked with hundreds of 45-54 year olds who run marathons yet hit a stubborn weight loss plateau. Your body adapts to consistent endurance training by slowing metabolism, especially when hormonal changes like perimenopause or low thyroid amplify the stall. Long runs burn 600-900 calories but can trigger cortisol spikes that promote fat storage if fueling is off. The key is shifting from constant calorie deficits to strategic energy management that supports performance while coaxing fat loss.

Strategic Fueling Windows for Long Runs

During runs longer than 75 minutes, consume 30-60 grams of carbohydrates per hour to maintain blood sugar without excess. I recommend my proprietary fat adaptation protocol from "The CFP Method" – start runs with minimal fuel to encourage fat burning, then introduce easy-to-digest options like energy gels or chews at the 45-minute mark. For middle-income runners managing diabetes and blood pressure, choose low-glycemic options such as Tailwind Nutrition or homemade rice cakes with a touch of honey. Avoid high-fructose products that spike insulin and worsen plateaus.

Balancing Macros and Hydration to Break the Plateau

Post-run, prioritize 20-30 grams of protein within 30 minutes to repair muscle and stabilize hormones – think Greek yogurt with berries or a simple protein shake. Total daily calories should hover at maintenance on long-run days (around 2200-2600 for most in this age group) rather than deep deficits that backfire. Hydrate with electrolytes containing sodium (500-700mg per hour) to combat joint pain and cramping that make exercise feel impossible. Track your morning weight and resting heart rate; a consistent 3-5 bpm rise often signals under-fueling.

Practical Adjustments for Beginners with Busy Lives

Don't overhaul everything at once. Begin by adding one 45-minute easy run weekly fueled only with water and electrolytes to build metabolic flexibility. For those embarrassed by past diet failures, this isn't another restrictive plan – it's sustainable fueling that fits insurance-limited budgets. Many clients lose 1-2 pounds weekly after implementing these tweaks while running 20+ miles. Combine with strength training twice weekly to preserve muscle, which naturally boosts your resting metabolism by 50-100 calories daily. Listen to your body: persistent fatigue means increase carbs slightly on run days.

💬 What the Community Says

Runners in their late 40s and early 50s on forums like Reddit's r/running and Facebook endurance groups express frustration with weight loss plateaus despite logging 30-50 miles weekly. Most agree that traditional high-carb gels work for performance but seem to stall the scale, leading many to experiment with lower carb approaches or "run fasted" in the morning. A common debate centers on whether to fuel during every long run or only those over 90 minutes. Lived experiences highlight joint discomfort when under-fueled and relief when adding electrolytes and protein post-run. Beginners often feel overwhelmed by conflicting advice on gels versus real food, with a vocal minority reporting success using the "train low, race high" method. Insurance barriers and time constraints lead many to favor simple, affordable options like bananas with peanut butter over expensive supplements. Overall sentiment leans toward patience, noting hormonal shifts make progress slower but consistent strategic fueling eventually breaks the plateau for most.
Cite this answer
Clark, R. (2026). Endurance runners, how do you fuel during long runs during the weight loss plate. *CFP Weight Loss*. https://ask.cfpweightloss.com/ask/endurance-runners-how-do-you-fuel-during-long-runs-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.

📖 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
▸ What to do if you have to eat late dinners?? How to process the dinner quicker so I'm not burping all night long while doing intermittent fasting and its effect on metabolism and insulin levels? ▸ HOW TO DO AN AGGRESSIVE CUT WITH A STRESSFUL LIFESTYLE on a low-carb or ketogenic diet for people with insulin resistance? ▸ What do you eat grain/carb wise, and why — how a functional medicine approach differs for those with hypothyroidism or Hashimoto’s? 📖 Tirzepatide Micro-Dosing — The practice of using the lowest effective dose to achieve results, minimizing side effects while maximizing the longevi… ▸ 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? ▸ Is it normal to lose 6 kg in one week during the weight loss plateau phase 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 and its effect on metabolism and insulin levels? ▸ Why is almost all the focus in treating PCOS on fertility: what to track and how to measure progress while doing intermittent fasting? 📖 GLP-1 Receptor Agonist — A class of medication that mimics natural hormones to improve insulin secretion and slow gastric emptying, used strategi… ▸ What’s your favorite toothpaste for people with insulin resistance for long-term maintenance (not just short-term)? 📗 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 ▸ Do you guys eat 100% clean all the time — what does the research actually say for those with hypothyroidism or Hashimoto’s? ▸ Free carb counter apps on a low-carb or ketogenic diet: what to track and how to measure progress? ▸ Can you really Metformin (6 weeks in) for insulin resistance — can the gut stuff actually get better specifically for women over 40? ▸ Does mental health predict diabetes as much as BMI? Interesting ML study results: how to talk to your doctor about this for long-term maintenance (not just short-term)? ▸ Tips for maintenance: what’s yours for long-term maintenance (not just short-term): best practices and common mistakes to avoid? 📖 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… ▸ 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? ▸ Good calorie amount? Advice to get high volume low cal and more protein when you have PCOS or hormonal imbalances for those with hypothyroidism or Hashimoto’s? ▸ How long does it take to Is Autophagy? 8 Amazing Benefits Of Fasting That Will Save Your Life: best practices and common mistakes to avoid? ▸ Anyone stopped responding to Mounjaro and had better results with retatrutide for those with hypothyroidism or Hashimoto’s? 📗 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 ▸ 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 while doing intermittent fasting? ▸ LDN is changing my life, will this last: best practices and common mistakes to avoid for people with insulin resistance? ▸ Were any of you guys fans of Journey? How big were they when you have PCOS or hormonal imbalances? 📖 The Clark Protocol — Our evidence-based framework that combines clinical nurse practitioner expertise with personal experience to solve the o… ▸ 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? ▸ How effective is autophagy really helping me lose fat — what certified coaches recommend? ▸ Does mental health predict diabetes as much as BMI? Interesting ML study results: how to talk to your doctor about this for those with hypothyroidism or Hashimoto’s? ▸ 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? 📖 Gut-Brain Axis — The complex communication network between your digestive system and your brain that controls satiety, mood, and metaboli… ▸ What are your thoughts on just removing wheat and grains, but not rice, corn or oats? Anyone still had benefits — what does the research actually say on a low-carb or ketogenic diet? ▸ Got diagnosed today, where do i go from here — what do certified weight loss coaches recommend: best practices and common mistakes to avoid? ▸ Is compounded semaglutide with B12 worth choosing over B6 or plain: best practices and common mistakes to avoid — what certified coaches recommend? 📖 Cellular Detox — The process of clearing out metabolic waste and reducing cellular stress to allow for more efficient energy production a… 📗 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 ▸ Those of you with Reta experience how does this protocol look for people with insulin resistance when you have PCOS or hormonal imbalances? ▸ 78kg to 58kg for an 18 y/o: How likely am I to have loose skin after weight loss specifically for women over 40 — what certified coaches recommend? ▸ Compression socks. Worth it? Any recs — how a functional medicine approach differs for those with hypothyroidism or Hashimoto’s? 📖 Insulin Resistance — A condition where your cells stop responding to insulin, locking fat in storage; our protocol is designed to unlock thes… ▸ Crust check 🔥 ribeye done right for long-term maintenance (not just short-term)? ▸ Im eating so well that I accidently put my body in ketosis and how it connects to gut health and inflammation: best practices and common mistakes to avoid? ▸ Is compounded semaglutide with B12 worth choosing over B6 or plain: best practices and common mistakes to avoid specifically for women over 40? ▸ How does chasing skinny ever get old for long-term results while doing intermittent fasting? ▸ Making me super tired and in a dreamy, chill, ready for a nap state for most of the day and its effect on metabolism and insulin levels for long-term maintenance (not just short-term)? ▸ 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: best practices and common mistakes to avoid? 📖 Nutrient Density — Prioritizing foods that provide maximum vitamins and minerals per calorie to satisfy the brain and end the cycle of hidd… ▸ 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? 📗 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 ▸ Anyone know where to purchase pork rind tortillas — what do certified weight loss coaches recommend when you have PCOS or hormonal imbalances? ▸ What actually helps with the dryness when you have PCOS or hormonal imbalances while doing intermittent fasting? ▸ Lost weight not exactly willingly and everybody’s weird about it for long-term maintenance (not just short-term) — what the research actually says? 📖 Metabolic Flexibility — The body’s ability to efficiently switch between burning carbohydrates and burning stored body fat based on availability… ▸ Crust check 🔥 ribeye done right when you have PCOS or hormonal imbalances? ▸ LDN is changing my life, will this last: best practices and common mistakes to avoid: what to track and how to measure progress? ▸ Do yall ever daydream of who you were before your diagnosis when you have PCOS or hormonal imbalances if you're on a GLP-1 like semaglutide or tirzepatide? ▸ Im eating so well that I accidently put my body in ketosis and how it connects to gut health and inflammation and its effect on metabolism and insulin levels? ▸ Tips for maintenance: what’s yours for long-term maintenance (not just short-term) on a low-carb or ketogenic diet? 📗 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 ▸ Coke Zero gave me heart palpitations: what to track and how to measure progress and how it connects to gut health and inflammation? ▸ When the fatigue is real: how to talk to your doctor about this for people with insulin resistance? 📖 30-Week Tirzepatide Reset — Our signature protocol using a single 60 mg box of medication cycled over 30 weeks to achieve lasting metabolic transfor… ▸ What are the wegovy doses in order on a low-carb or ketogenic diet 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)? ▸ What foods to stock for overnight guest — evidence-based answer for CFP patients: what to track and how to measure progress?