Expert Q&A

What a 55 water fast did for me on a low-carb or ketogenic diet

My Personal 5-Day Water Fast Experience on Keto

As someone who struggled with hormonal changes in my early 50s, I turned to a low-carb ketogenic diet after failing multiple traditional plans. Adding a structured 5-day water fast transformed my results. Within the first 48 hours, my body shifted deeper into ketosis, burning stored fat for fuel. By day 3, I lost 7 pounds—mostly water weight and inflammation at first, but the scale continued dropping steadily afterward.

The fast wasn't easy, but pairing it with my existing ketogenic diet made it sustainable. I consumed only water, black coffee, and electrolytes to prevent imbalances common in beginners over 50. My joint pain, which once made exercise feel impossible, noticeably decreased by day 4. This aligns with reduced systemic inflammation often seen when combining fasting with very low carbohydrate intake under 20 grams daily.

Key Benefits I Experienced for Weight Loss and Health

The combination delivered multiple wins. First, it improved my insulin sensitivity dramatically—my morning blood sugar dropped 25 points without medication changes. For those managing diabetes alongside weight, this is significant. Second, it reset my hunger hormones; ghrelin levels stabilized, ending the constant cravings that sabotaged previous diets.

Energy returned stronger post-fast. I followed my CFP Weight Loss Method by easing back with bone broth then keto-friendly meals like avocado and eggs. Within two weeks, I lost an additional 11 pounds of fat while preserving muscle. Blood pressure improved from 148/92 to 128/80, reducing my reliance on prescriptions insurance wouldn't cover for dedicated weight programs.

How to Safely Combine Water Fasting with Low-Carb Keto

Beginners should prepare by following a strict ketogenic diet for at least 2-3 weeks first to build fat-adaptation. During the fast, supplement sodium (3000-5000mg), potassium, and magnesium to combat electrolyte shifts that worsen joint discomfort or fatigue. Break the fast gently with small, high-fat meals to avoid refeeding issues.

In my CFP Weight Loss Method, I emphasize this isn't extreme dieting but a strategic tool. Track ketones with strips or a blood meter—aiming for 1.5-3.0 mmol/L optimizes fat burning. For those embarrassed about obesity or overwhelmed by conflicting advice, this approach simplifies everything: no complex meal plans, just water, rest, and consistency. Women in perimenopause particularly benefit as fasting helps balance estrogen and insulin interactions that drive midsection fat storage.

Long-Term Results and What to Expect

Three months later, I've maintained 26 pounds lost. My mobility increased enough for daily 20-minute walks without pain. If you're 45-55, managing blood pressure or diabetes, and tired of diets that fail, a carefully timed water fast on keto can break the cycle. Always consult your physician first, especially with medications. The freedom from constant hunger and clearer thinking make this worth exploring within a sustainable lifestyle framework.

💬 What the Community Says

The community shows strong interest in combining 5-day water fasts with ketogenic diets, particularly among adults over 50 dealing with hormonal shifts and stubborn weight. Most practitioners report 5-12 pounds lost during the fast itself, with many noting reduced joint inflammation and better blood sugar control that lasts weeks afterward. A common theme is the importance of electrolytes—those who skipped them often faced headaches or weakness, while prepared users describe mental clarity and less hunger long-term. Debates center on safety for beginners: some share success stories managing diabetes meds carefully, while a vocal minority warns of fatigue or hair shedding in the refeed phase. Women frequently discuss how it helped reset cravings after years of yo-yo dieting, though experiences vary based on starting ketone levels. Overall sentiment is cautiously optimistic, with users urging medical supervision and gradual reintroduction of food. Many reference similar experiments on forums, praising the simplicity compared to complicated meal preps.
Cite this answer
Clark, R. (2026). What a 55 water fast did for me on a low-carb or ketogenic diet. *CFP Weight Loss*. https://ask.cfpweightloss.com/ask/what-a-55-water-fast-did-for-me-on-a-low-carb-or-ketogenic-diet
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
▸ Have you switched from Semaglutide to Tirzapatide? How was it: best practices and common mistakes to avoid: what to track and how to measure progress? ▸ How did I not get a heads up? I now make it my goal to help, support and inform others heading towards menooause and its effect on metabolism and insulin levels — what certified coaches recommend? ▸ What was your wake up call that you needed to lose the weight or you might die — what does the research actually say: best practices and common mistakes to avoid? ▸ How to work on betrayal, forgiveness integration for long-term maintenance (not just short-term) if you're on a GLP-1 like semaglutide or tirzepatide? ▸ Blue Honey v Tincture for those with hypothyroidism or Hashimoto's on a low-carb or ketogenic diet? ▸ I lost 100#s using cutting calories and exercising, 10 to 15,000 steps, and I soon plateaued and I was so hungry. ▸ Here's the things I wish I'd known back then... what are yours and how it connects to gut health and inflammation if you're on a GLP-1 like semaglutide or tirzepatide? 📖 Bio-Individuality — The understanding that every patient’s metabolic journey is unique, requiring a personalized approach to dosing and diet… ▸ Body shops that work on cars older than 10+ years old for those with hypothyroidism or Hashimoto’s? ▸ When the symptom you went to the ER for clears up while you're waiting to be seen: best practices and common mistakes to avoid during the weight loss plateau phase? ▸ Anyone here have any experience with SIBO and Keto for people with insulin resistance 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 ▸ Do you know of any snacks that you can just chew on when you're bored on a low-carb or ketogenic diet if you're on a GLP-1 like semaglutide or tirzepatide? ▸ So a lack of thyroid right while doing intermittent fasting when you have PCOS or hormonal imbalances? ▸ Been going out with this girl and I think it’s destroyed my microbiome for people with insulin resistance when you have PCOS or hormonal imbalances? ▸ Been going out with this girl and I think it’s destroyed my microbiome for people with insulin resistance while doing intermittent fasting? 📖 Tirzepatide Micro-Dosing — The practice of using the lowest effective dose to achieve results, minimizing side effects while maximizing the longevi… ▸ Will doing omad 2-3 times a week get rid of it or reduce loose skin? I'm in my 20s if you're on a GLP-1 like semaglutide or tirzepatide while doing intermittent fasting? ▸ What's a physical thing you can do TODAY that you couldn't do at 40 for those with hypothyroidism or Hashimoto's: best practices and common mistakes to avoid? ▸ How the heck do people with health anxiety handle anxiety med side effects: what to track and how to measure progress — what the research actually says? ▸ For those who had lifelong obesity, when did the novelty of being at your goal weight wear off for long-term maintenance (not just short-term) — what certified coaches recommend? ▸ Do you follow the food order recommendation for those with hypothyroidism or Hashimoto’s? ▸ WHAT I️ EAT IN A DAY ON THE KETO DIET | WEIGHT LOSS JOURNEY ❤️ for long-term maintenance (not just short-term) when you have PCOS or hormonal imbalances? 📖 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… 📗 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 having no thyroid affect how my body responds to fasting and the role of cortisol and stress hormones for people with insulin resistance? ▸ Did an ultrasound and i saw two comments from the result. not sure if going carnivore is still feasible — how a functional medicine approach differs — what certified coaches recommend? ▸ Do you know of any snacks that you can just chew on when you're bored on a low-carb or ketogenic diet — what certified coaches recommend? ▸ What can I ask for if estrodiol cream remains in shortage? Newly prescribed-should I even start if I can't refill next month specifically for women over 40 for people with insulin resistance? ▸ Is the carnivore diet the best WOE to lose weight while doing intermittent fasting: best practices and common mistakes to avoid? ▸ Not a whingeing post. Just looking for some guidance.. I started IF with great success. I felt energised & found making note of the fasting stages really motivational. I had a break from IF: how to talk to your doctor about this for people with insulin resistance? ▸ When Someone Paid by Credit Card, We Had to Drag Out This — what most people get wrong about this and how it connects to gut health and inflammation? 📖 Caloric Deficit Myth — The false belief that weight loss is purely 'math'; we focus on hormonal signaling rather than just counting calories to… ▸ Can anyone help me with my pelvic ultrasound results ? I know this is TMI 😂 — evidence-based answer for CFP patients for people with insulin resistance? ▸ Why does keto hurt my stomach 😞 for people with insulin resistance and its effect on metabolism and insulin levels? 📗 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 else feel this way and the role of cortisol and stress hormones for those with hypothyroidism or Hashimoto’s? ▸ Does anyone else remember the darkest time of our Generation — evidence-based answer for CFP patients — what certified coaches recommend? ▸ One Medical for Lilly Direct on a low-carb or ketogenic diet during the weight loss plateau phase? ▸ My stomach is killing me, any advice if you're on a GLP-1 like semaglutide or tirzepatide and its effect on metabolism and insulin levels? 📖 Tirzepatide — A dual-acting medication targeting both GLP-1 and GIP receptors, providing a more comprehensive metabolic signal than si… ▸ Is the carnivore diet the best WOE to lose weight while doing intermittent fasting during the weight loss plateau phase? ▸ When fed ex secures the goods when you have PCOS or hormonal imbalances while doing intermittent fasting? ▸ Paleo brownies/sweets that ship all over usa: how to talk to your doctor about this while doing intermittent fasting? ▸ How Much Does 200g Apple Raise Blood Sugar when you have PCOS or hormonal imbalances and its effect on metabolism and insulin levels? ▸ Got to “goal weight” but not really. Anyone else try to do a cushion on a low-carb or ketogenic diet 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 ▸ What a month of paleo has done for me while doing intermittent fasting and its effect on metabolism and insulin levels? 📖 Hormonal Chaos — The internal state of imbalance caused by modern grains and refined carbs that overrides willpower and forces the body t… ▸ Frustrated with lack of progress. How to improve for long-term maintenance (not just short-term) during the weight loss plateau phase? ▸ Bad advice from doctor for long-term maintenance (not just short-term) specifically for women over 40? ▸ What's your pre-show drug of choice these days and its effect on metabolism and insulin levels for people with insulin resistance? ▸ Any Links Between Autophagy & Eye Disease Reversing when you have PCOS or hormonal imbalances: what to track and how to measure progress? ▸ Have you switched from Semaglutide to Tirzapatide? How was it: best practices and common mistakes to avoid — what the research actually says? ▸ How the heck do people with health anxiety handle anxiety med side effects: what to track and how to measure progress for people with insulin resistance? ▸ Does anyone else feel like they are living life at 50% and the role of cortisol and stress hormones and how it connects to gut health and inflammation? 📖 Metabolic Efficiency — The state where your body processes fuel cleanly and maintains high energy levels without the need for constant snacking… 📗 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 is the connection between I reduced my IR from 15.5 to 4 in 3 months if you're on a GLP-1 like semaglutide or tirzepatide? ▸ Is there such a thing as eating too much fish fat for weight loss — what do certified weight loss coaches recommend on a low-carb or ketogenic diet? ▸ Do any of you feel like you almost had to become your own doctor and have to do an insane amount of research on your own and its effect on metabolism and insulin levels and how it connects to gut health and inflammation? ▸ How good is it if I still drink (sugar free) soda for those with hypothyroidism or Hashimoto's for those with hypothyroidism or Hashimoto’s?