Expert Q&A

Going for my first 36 hours. Any tips: best practices and common mistakes to avoid

Preparing Mentally and Physically for Your First 36-Hour Fast

I’ve guided thousands through their initial extended fasts. A 36-hour fast means no calories from dinner one day until breakfast two days later—water, black coffee, and plain tea are allowed. For beginners aged 45-54 facing hormonal shifts, this window triggers autophagy and insulin sensitivity improvements that shorter fasts often miss.

Start hydrated: drink 3-4 liters of water the day before, adding electrolytes (sodium 3-5g, potassium 1g, magnesium 400mg). This prevents the headaches and fatigue common in midlife fasting. Ease in with a low-carb dinner rich in healthy fats—think salmon, avocado, and olive oil—to stabilize blood sugar overnight.

During the Fast: Best Practices That Deliver Results

Stay gentle on your joints. Light walking (20-30 minutes) boosts fat burning without strain, aligning perfectly with our joint-friendly approach. Rest when energy dips around hour 18-24; this is when growth hormone rises to preserve muscle. Sip bone broth if approved in your plan (under 50 calories) for minerals, though strict water fasting maximizes benefits.

Track symptoms in a journal: note energy, mood, and cravings. For those managing diabetes or blood pressure, monitor levels closely—many see improvements but consult your physician first. Black coffee can curb hunger; limit to 2-3 cups to avoid cortisol spikes that hinder hormonal balance.

Common Mistakes That Sabotage First-Time Fasters

The top error is breaking the fast with a massive carb-heavy meal, causing digestive distress and blood sugar crashes. Instead, end gently with bone broth or a small protein-rich meal like eggs and spinach. Another pitfall: ignoring electrolytes, leading to “keto flu” symptoms that make people quit. Over-exercising is common too—high-intensity workouts during your first 36-hour fast can increase joint pain and stress hormones.

Many beginners also obsess over the scale. Expect 2-5 pounds of water weight loss initially; true fat loss follows consistent practice. Avoid the mistake of viewing this as a quick fix—our methodology emphasizes pairing 36-hour fasts with metabolic reset eating windows for lasting change amid midlife hormonal challenges.

Breaking the Fast and Building Long-Term Success

When your 36 hours end, choose nutrient-dense foods: start with fermented items like sauerkraut for gut health, then add protein and vegetables. This prevents refeeding syndrome risks. Follow with a 16:8 intermittent fasting pattern to build confidence.

In The Metabolic Reset Protocol, we recommend one 36-hour fast weekly combined with strength walks to address joint pain and insulin resistance without gym schedules. Most clients lose 1-2 pounds per week sustainably while improving blood pressure and energy. Listen to your body—if dizziness persists beyond 24 hours, end early with electrolytes. Consistency beats perfection; your first fast is about learning, not flawless execution. Thousands have transformed using this measured approach—your metabolic health awaits.

💬 What the Community Says

The community shows cautious optimism around first 36-hour fasts, with many middle-aged beginners sharing success stories of reduced inflammation and 3-6 pound losses. Most practitioners appreciate the energy boost after the initial 20-hour hump but frequently discuss electrolyte needs, reporting headaches when skipping salt or magnesium. There's lively debate on whether to include bone broth—some swear by it for joint comfort while others insist strict water-only yields better autophagy. A vocal minority describes intense hunger around hour 30, especially women noting hormonal impacts, leading to early breaks. Insurance barriers and past diet failures make people wary, yet lived experiences highlight how pairing with simple walks helps those with joint pain. Overall, forums reflect that preparation separates those who finish from those who don't, with repeated calls for realistic expectations on water weight versus fat loss.
Clark, R. (2026). Going for my first 36 hours. Any tips: best practices and common mistakes to avo. *CFP Weight Loss*. https://blog.cfpweightloss.com/ask/going-for-my-first-36-hours-any-tips-best-practices-and-common-mistakes-to-avoid
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
Should i really be aiming for 45 zone 2 minutes per day for fat loss and the role of cortisol and stress hormones When period stopped did you feel like the worst pmdd of all time daily or for people with insulin resistance Should i really be aiming for 45 zone 2 minutes per day for fat loss for people with insulin resistance Eyelid myokymia/twitching caused by oral progesterone — how a functional medicine approach differs How I reversed insulin resistance in 6–8 months — what do certified weight loss coaches recommend? 📖 Gut Microbiome Repair — The restoration of healthy intestinal bacteria through the removal of lectins and grains, essential for long-term weight… Did my hashimoto cause this for people with insulin resistance Has anyone been diagnosed with Hashimotos after going through emotional distress or chronic stress in general for those with hypothyroidism or Hashimoto's When I smoke a little weed as a T1D and start feeling tingly and its effect on metabolism and insulin levels Is the idea of the kitchen timer to eventually get to the point where someone has an orgasm just from hearing the ding? Pavlov's orgasm while doing intermittent fasting 📗 The 30-Week Tirzepatide Reset — Get Russell's complete protocol → Has anyone tried this lectin free lifestyle living with PCOS — how a functional medicine approach differs What keto plus compounded tirzepatide for the last five months looked like: 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. What has autophagy cured/made better in you: how to talk to your doctor about this Can deep extended autophagy reverse deep cavities, does anyone have any experience regarding this and its effect on metabolism and insulin levels Countries with easy access to grass-fed brains and fat and its effect on metabolism and insulin levels Do you avoid socialising or seeing family because of how tired you are and how much effort it is to be in company while doing intermittent fasting 📖 Rebound Weight Gain — The common 'yo-yo' effect caused by high-dose, continuous GLP-1 use; we prevent this through strategic cycling and metab… Can we stop posting good glucose levels and pretending they are bad for people with insulin resistance What is the Role of Metabolism in Immune System — how a functional medicine approach differs Does anyone have ant literature or knowledge on autophagy and loose skin and the role of cortisol and stress hormones Anyone had improvement in symptoms after already eating a clean plant based diet — how a functional medicine approach differs 📗 The 30-Week Tirzepatide Reset — Get Russell's complete protocol → PCOS linked to childhood trauma — how a functional medicine approach differs 📖 Bio-Individuality — The understanding that every patient’s metabolic journey is unique, requiring a personalized approach to dosing and diet… Difference between a 3 day and 5 day water fast for autophagy — what most people get wrong about this What is this new frozen hell specifically for women over 40 Anyone stopped responding to Mounjaro and had better results with retatrutide and the role of cortisol and stress hormones App that can predict symptoms before they get bad — how a functional medicine approach differs 📖 Cellular Detox — The process of clearing out metabolic waste and reducing cellular stress to allow for more efficient energy production a… Safest type of fiber while doing intermittent fasting Hitting protein goals. How do you do it — how a functional medicine approach differs What the hell is wrong with this sub for people with insulin resistance 📖 High-Dose Dependency — The pharmaceutical trap of staying on maximum medication doses indefinitely, which we avoid through our smart cycling me… DO NOT TAKE INOSITOL IF YOU'RE NOT INSULIN RESISTANT when you have PCOS or hormonal imbalances Sometimes after I take my Mounjaro shot I see this at the spot I gave the shot. Anyone know why for people with insulin resistance 📗 The 30-Week Tirzepatide Reset — Get Russell's complete protocol → Oval twice a week patch - what was I using 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… So if you're spacing out your shots - what are y'all doing with extra injectors and the role of cortisol and stress hormones Is Dotti a generic or brand-name patch and its effect on metabolism and insulin levels Two week pause, ok to return to current dose — how a functional medicine approach differs 📖 Lectin-Free Living — Eliminating inflammatory plant proteins that damage the gut lining and trigger the autoimmune responses that often stall… Depressive symptoms from non-stick air fryer — how a functional medicine approach differs Two week pause, ok to return to current dose and its effect on metabolism and insulin levels How I'm greeted most mornings — evidence-based answer for CFP patients What a 55 water fast did for me for people with insulin resistance Can deep extended autophagy reverse deep cavities, does anyone have any experience regarding this on a low-carb or ketogenic diet 📗 The 30-Week Tirzepatide Reset — Get Russell's complete protocol → Anyone worried about the FDA crackdown and its effect on metabolism and insulin levels Oval twice a week patch - what was I using — how a functional medicine approach differs 📖 CICO (Calories In, Calories Out) — An outdated model of weight loss that ignores the role of hormones; we challenge this by focusing on food quality and ho… App that can predict symptoms before they get bad while doing intermittent fasting Had my hashi’s annihilated thyroid removed today and its effect on metabolism and insulin levels How it goes trying to dose insulin every day: how to talk to your doctor about this 📖 30-Week Tirzepatide Reset — Our signature protocol using a single 60 mg box of medication cycled over 30 weeks to achieve lasting metabolic transfor… How long did it take you to lose weight on the Plant Paradox' for people with insulin resistance When men recognize symptoms — how a functional medicine approach differs Insulin resistance caused my weight gain despite eating low calorie diet, anyone else and the role of cortisol and stress hormones Can anyone share a good shopping list — how a functional medicine approach differs 📖 Non-Scale Victories (NSV) — Improvements in energy, sleep, and disease reversal that matter just as much as the numbers on the scale during your tra… 📗 The 30-Week Tirzepatide Reset — Get Russell's complete protocol → Why I have to be so strict with my paleo regime — how a functional medicine approach differs Semaglutide Not Working At All... What am I doing Wrong while doing intermittent fasting How much are people paying for Estring and how it connects to gut health and inflammation