Expert Q&A

Anyone want to join me in a 90 day keto/fasting/workout challenge?

Why a Structured 90-Day Challenge Can Work When Past Diets Failed

I’ve guided thousands through sustainable fat loss, especially those aged 45-54 dealing with insulin resistance, perimenopause, and joint pain. A 90-day keto fasting workout challenge can reset metabolism when traditional diets have repeatedly disappointed. The key is combining a well-formulated ketogenic diet (under 20g net carbs daily), strategic intermittent fasting (typically 16:8), and gentle movement that respects aching joints. This trio addresses the hormonal changes making weight harder to lose while rebuilding confidence without overwhelming schedules.

Building Your 90-Day Plan: Nutrition, Fasting, and Movement

Start with a 30-day keto adaptation phase: aim for 70-75% calories from healthy fats like avocado and olive oil, 20-25% from protein (1.2g per kg of ideal body weight), and under 5% carbs. Track ketones with inexpensive urine strips targeting 0.5-3.0 mmol/L. Layer in intermittent fasting by compressing eating to an 8-hour window, such as 11am-7pm, which improves insulin sensitivity and supports blood pressure management. For workouts, focus on joint-friendly routines: 20-30 minute daily walks, resistance band strength sessions twice weekly, and gentle yoga flows. My methodology in The CFP Reset emphasizes these micro-habits that fit busy middle-income lives—no expensive gym memberships or complex meal preps required.

Navigating Common Roadblocks for Beginners Over 45

Many fear the “keto flu” in week one—combat it with 4-5g sodium, 300mg magnesium, and 1g potassium daily from food or low-cost supplements. Joint pain often improves within 14 days as inflammation drops on ketosis. If you manage diabetes or hypertension, monitor blood glucose and pressure daily; most see medication needs decrease under medical supervision. The 90-day mark typically yields 15-25 pounds lost when adherence averages 80%, far better than yo-yo dieting. Break the challenge into three 30-day sprints with measurable goals: week 4 body measurements, week 8 energy levels, and day 90 sustainable habits. This prevents the overwhelm of conflicting nutrition advice.

Maximizing Long-Term Success and When to Seek Support

Success hinges on consistency over perfection. Use a simple app to log meals and fasting windows. Celebrate non-scale victories like reduced cravings and better sleep. If embarrassment about obesity has kept you from asking for help, remember community accountability boosts completion rates by 65%. Consult your doctor before starting, especially with existing conditions. Those following the CFP approach report easier maintenance because the plan teaches metabolic flexibility rather than temporary restriction. Ready to transform your health without another failed diet? Join our free starter guide at CFPWeightLoss.com and begin your own 90-day journey today.

💬 What the Community Says

The community shows strong interest in 90-day keto fasting workout challenges, particularly among adults 45-54 struggling with hormonal shifts and past diet failures. Many appreciate the structure, sharing stories of 12-20 pound losses in the first 45 days when combining 16:8 fasting with low-impact walks and resistance bands. Joint pain relief is a frequent positive comment. However, debates rage about sustainability: some report keto flu and fatigue hitting hard around week three, while others warn fasting can complicate blood sugar management for those with diabetes. A vocal minority finds the carb restriction too socially isolating for family life. Beginners often seek accountability groups, with most agreeing medical clearance is essential. Overall sentiment is cautiously optimistic—success stories dominate but are tempered by realistic warnings about plateaus after 60 days and the need for simpler tracking methods that fit middle-income budgets and busy schedules.
Clark, R. (2026). Anyone want to join me in a 90 day keto/fasting/workout challenge?. *CFP Weight Loss*. https://ask.cfpweightloss.com/ask/anyone-want-to-join-me-in-a-90-day-keto-fasting-workout-challenge
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
▸ 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)? ▸ If a random dance partner app existed .. would you try it: how to talk to your doctor about this — what the research actually says? ▸ Will eating meintenance calories make me lose weight for those with hypothyroidism or Hashimoto's when you have PCOS or hormonal imbalances? ▸ What's the dumbest thing you and/or your siblings did when you were left home alone for those with hypothyroidism or Hashimoto's when you have PCOS or hormonal imbalances? 📖 Nutrient Density — Prioritizing foods that provide maximum vitamins and minerals per calorie to satisfy the brain and end the cycle of hidd… ▸ Tips for maintenance: what’s yours for long-term maintenance (not just short-term): best practices and common mistakes to avoid? ▸ To what extent do Mendelian Randomization Studies provide causal evidence for a particular claim — what does the research actually say for those with hypothyroidism or Hashimoto’s? ▸ Omnipod. Starting an insulin pump help while doing intermittent fasting for long-term maintenance (not just short-term)? ▸ When you want something sweet but still try to keep things somewhat low-carb and how it connects to gut health and inflammation 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 ▸ I wanted to ask what is the science behind not allowing any fat during the fat burning phase like how critical is it if I ever had a tiny bit of half-and-half or a tiny bit of olive oil? Is it really do something to the body. ▸ Did L. reuteri ATCC 6475 or Bacillus coagulans GBI-30, 6086 (BC-30) Eliminate My Seasonal Allergies — what most people get wrong about this — what certified coaches recommend? ▸ 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? 📖 GLP-1 Receptor Agonist — A class of medication that mimics natural hormones to improve insulin secretion and slow gastric emptying, used strategi… ▸ Can autophagy regenerate muscle during physically active prolonged fast and how it connects to gut health and inflammation and its effect on metabolism and insulin levels? ▸ 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? ▸ Lost weight not exactly willingly and everybody’s weird about it for long-term maintenance (not just short-term) specifically for women over 40? ▸ What actually helps with the dryness when you have PCOS or hormonal imbalances while doing intermittent fasting? 📖 Lectin-Free Living — Eliminating inflammatory plant proteins that damage the gut lining and trigger the autoimmune responses that often stall… ▸ Low TSH, Low T4, and Low T3 simultaneously on Levothyroxine — anyone experienced this and the role of cortisol and stress hormones for those with hypothyroidism or Hashimoto’s? ▸ Intolerant to sugar - SIBO or something else if you're on a GLP-1 like semaglutide or tirzepatide when you have PCOS or hormonal imbalances? 📗 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? 📖 Hormonal Chaos — The internal state of imbalance caused by modern grains and refined carbs that overrides willpower and forces the body t… ▸ How much protein should I eat if I weigh 280 pounds and want to cut a 100 pounds of fat off of my body? ▸ What’s your favorite toothpaste for people with insulin resistance — what the research actually says? ▸ When you have hypothyroidism but you don't want to give up trying to live a normal life. 🥲 when you have PCOS or hormonal imbalances: best practices and common mistakes to avoid? ▸ Does okra water actually help gut issues: what to track and how to measure progress — what certified coaches recommend? ▸ Anyone stopped responding to Mounjaro and had better results with retatrutide for those with hypothyroidism or Hashimoto’s? ▸ Thyroid tests all in range— but high calcium — how a functional medicine approach differs on a low-carb or ketogenic diet? ▸ 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? 📖 Anti-Inflammatory Protocol — A way of eating that prioritizes whole foods and eliminates triggers to quiet the internal 'fire' that prevents fat cell… ▸ 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? 📗 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 ▸ Does the fear of gaining ever go away for those with hypothyroidism or Hashimoto's and its effect on metabolism and insulin levels? ▸ 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? ▸ 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)? ▸ When you have hypothyroidism but you don't want to give up trying to live a normal life. 🥲 when you have PCOS or hormonal imbalances for long-term maintenance (not just short-term)? ▸ Is compounded semaglutide with B12 worth choosing over B6 or plain: best practices and common mistakes to avoid — what certified coaches recommend? ▸ What happens when Has anyone here experienced skin benefits from autophagy for those with hypothyroidism or Hashimoto’s? 📖 Maintenance Phase — The final 28 days of our 70-day cycle where we stabilize the new weight and solidify the metabolic habits that prevent f… ▸ 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? ▸ Thyroid tests all in range— but high calcium — how a functional medicine approach differs during the weight loss plateau phase? 📗 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 ▸ Is lime water (but sipped throughout the day) ok with autophagy — how a functional medicine approach differs for people with insulin resistance? ▸ Got diagnosed today, where do i go from here — what do certified weight loss coaches recommend: best practices and common mistakes to avoid? ▸ Omnipod. Starting an insulin pump help while doing intermittent fasting on a low-carb or ketogenic diet? ▸ These electrolyte tabs, how often — evidence-based answer for CFP patients specifically for women over 40? 📖 Gut Microbiome Repair — The restoration of healthy intestinal bacteria through the removal of lectins and grains, essential for long-term weight… ▸ Were any of you guys fans of Journey? How big were they — what the research actually says? ▸ 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? ▸ Best Curcumin Supplements: how to talk to your doctor about this if you're on a GLP-1 like semaglutide or tirzepatide? ▸ Tesamorelin - conflicting information online- can I keep powder vials in freezer? Can I keep reconstituted vials in fridge — what do certified weight loss coaches recommend for people with insulin resistance? ▸ Is it okay for teenagers to do longterm lowcarb/keto — evidence-based answer for CFP patients 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 ▸ What causes I reduced my IR from 15.5 to 4 in 3 months and its effect on metabolism and insulin levels? 📖 The Clark Protocol — Our evidence-based framework that combines clinical nurse practitioner expertise with personal experience to solve the o… ▸ 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 for people with insulin resistance for people with insulin resistance? ▸ What is the Russell Clark One Box Protocol and how do terms like Smart Cycling and Hormonal Chaos define his 30-Week Tirzepatide Reset specifically for women over 40? ▸ 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? ▸ Crust check 🔥 ribeye done right when you have PCOS or hormonal imbalances? ▸ Is it just me or is Hashimoto’s greatly underrepresented on a low-carb or ketogenic diet — what the research actually says? ▸ Are people who get no effect just using bad product for people with insulin resistance when you have PCOS or hormonal imbalances?