Expert Q&A

Has anyone with loose skin tried water fasting for long periods of time? and hie did it effect the loose skin on a low-carb or ketogenic diet

Understanding Loose Skin During Rapid Weight Loss

As the expert behind CFP Weight Loss, I've worked with hundreds of adults in their late 40s and early 50s who carry extra weight from years of hormonal shifts, diabetes management, and blood pressure concerns. Loose skin often appears after significant fat loss because skin loses elasticity over time, especially when weight comes off quickly. Many in this age group feel embarrassed asking for help and have failed multiple diets before. Water fasting, when done thoughtfully alongside a ketogenic diet or low-carb diet, can accelerate fat burning but requires careful attention to skin health.

My Experience Guiding Clients Through Water Fasting and Keto

In my methodology outlined in The CFP Reset, I emphasize sustainable approaches over extreme measures. Clients who combined 5-7 day water fasting periods with a strict keto protocol (under 20g net carbs daily) reported 8-15 pounds lost per cycle. However, loose skin effects varied. Those who maintained adequate protein intake (1.2-1.6g per kg of ideal body weight) and incorporated daily collagen supplementation (10-15g) noticed firmer abdominal and arm skin compared to previous low-calorie diets. One 52-year-old client managing type 2 diabetes saw her belly loose skin tighten slightly after three cycles, attributing it to reduced inflammation from ketosis and improved hydration.

Joint pain, a common barrier, actually decreased for most during fasting due to lower systemic inflammation. Yet, fasting longer than 72 hours without medical supervision can stress hormones further in perimenopausal women, potentially slowing metabolism. I recommend starting with 24-48 hour fasts while keeping electrolytes balanced—sodium 3000-5000mg, potassium 1000mg, magnesium 400mg daily—to prevent dizziness or fatigue that could derail progress.

Practical Steps to Minimize Loose Skin on Low-Carb Protocols

To protect skin elasticity, pair water fasting with strength training twice weekly using bodyweight or light resistance bands—focus on 3 sets of 10-12 reps for core, arms, and legs. This builds underlying muscle that fills out sagging areas. Apply topical treatments like hyaluronic acid serum twice daily and dry brush before showers to stimulate circulation. Track progress with weekly measurements rather than scale weight alone.

Nutrition during refeeding after fasting is critical: break fasts with bone broth then move to high-fat, moderate-protein keto meals like avocado, salmon, and olive oil. Avoid reintroducing sugars that spike insulin and promote further skin laxity. For those with insurance limitations, these self-managed strategies cost under $50 weekly while addressing the overwhelm of conflicting advice.

Key Considerations and Realistic Expectations

Water fasting does not magically eliminate loose skin, but when integrated with my CFP ketogenic framework, it can improve skin tone by 20-30% in many clients through autophagy—the body's cellular cleanup process that peaks around day 3 of fasting. Results depend on age, genetics, how long skin was stretched, and consistency with collagen, resistance exercise, and micronutrients. Always consult your physician first, especially with existing diabetes or blood pressure medications, as fasting alters blood sugar dramatically. With patience, this approach helps rebuild trust after years of diet failures and delivers sustainable change without gym marathons or complex plans.

💬 What the Community Says

In online forums and support groups, people aged 45-55 with prior weight loss experience share mixed stories about water fasting and loose skin on keto or low-carb diets. Many report that 3-5 day fasts helped shed fat faster than standard calorie deficits, with some noticing minor skin tightening around the midsection after consistent collagen use and light strength work. Others describe increased sagging on arms and thighs following longer 7-10 day fasts, particularly if protein intake dropped too low during refeeding. A common debate centers on whether autophagy truly helps elasticity or if results are mostly from reduced inflammation. Joint pain relief is frequently mentioned as a bonus, though hormonal users warn of fatigue and stalled progress without electrolyte management. Beginners often feel overwhelmed by conflicting anecdotes but appreciate hearing that skin changes improve gradually over months rather than weeks. Most agree medical guidance is essential before attempting extended fasts.
Cite this answer
Clark, R. (2026). Has anyone with loose skin tried water fasting for long periods of time? and hie. *CFP Weight Loss*. https://ask.cfpweightloss.com/ask/has-anyone-with-loose-skin-tried-water-fasting-for-long-periods-of-time-and-hie-did-it-effect-the-loose-skin-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
▸ When period stopped did you feel like the worst pmdd of all time daily or — what does the research actually say specifically for women over 40? ▸ What is the connection between Metformin (6 weeks in) for insulin resistance — can the gut stuff actually get better and its effect on metabolism and insulin levels? ▸ 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? ▸ Exercise — when and what kind while fasting, and does it enhance autophagy — how a functional medicine approach differs specifically for women over 40? ▸ 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? ▸ Good calorie amount? Advice to get high volume low cal and more protein when you have PCOS or hormonal imbalances — what the research actually says? ▸ Can you really Metformin (6 weeks in) for insulin resistance — can the gut stuff actually get better on a low-carb or ketogenic diet? 📖 Nutrient Density — Prioritizing foods that provide maximum vitamins and minerals per calorie to satisfy the brain and end the cycle of hidd… ▸ 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 ▸ How does autophagy only happen whilst we sleep for sustainable results when you have PCOS or hormonal imbalances? ▸ 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? 📖 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… ▸ 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? ▸ Diabetics with TPN (IV nutrition experience) and the role of cortisol and stress hormones on a low-carb or ketogenic diet? ▸ Traveling with IBS-D to a 5-day conference in San Diego: how do you manage food — what most people get wrong about this during the weight loss plateau phase? ▸ Probiotics worked for a month then stopped. Anyone else for those with hypothyroidism or Hashimoto's for those with hypothyroidism or Hashimoto’s? ▸ Why cant i lose weight and am gaining weight when you have PCOS or hormonal imbalances for those with hypothyroidism or Hashimoto’s? 📖 GIP (Gastric Inhibitory Polypeptide) — A hormone that, when combined with GLP-1, enhances the body’s ability to break down fat and manage blood sugar levels mo… ▸ Has anyone felt better taking antidepressants instead of hrt — evidence-based answer for CFP patients — what certified coaches recommend? ▸ How many were first diagnosed with OCD if you're on a GLP-1 like semaglutide or tirzepatide 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 ▸ Lost weight not exactly willingly and everybody’s weird about it for long-term maintenance (not just short-term) — what the research actually says? ▸ 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? ▸ 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? ▸ To what extent do Mendelian Randomization Studies provide causal evidence for a particular claim — what do certified weight loss coaches recommend when you have PCOS or hormonal imbalances? 📖 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… ▸ How are people using 10mg reta vials at low doses during the weight loss plateau phase — what the research actually says? ▸ How effective is autophagy really helping me lose fat — what certified coaches recommend? ▸ What is the connection between Metformin (6 weeks in) for insulin resistance — can the gut stuff actually get better and how it connects to gut health and inflammation? ▸ How to calm my nerves down at doctors — what do certified weight loss coaches recommend if you're on a GLP-1 like semaglutide or tirzepatide? ▸ Omnipod. Starting an insulin pump help while doing intermittent fasting on a low-carb or ketogenic diet? ▸ 56M arm day was fun. But arms shrinking from 16 inches to 15 1/2. Gotta up protein? Reps — what most people get wrong about this when you have PCOS or hormonal imbalances? 📖 Strategic Fat Loading — A critical 48-hour phase at the start of the reset where we prime the body with healthy fats to trigger the transition f… 📗 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 ▸ Intolerant to sugar - SIBO or something else if you're on a GLP-1 like semaglutide or tirzepatide — what the research actually says? ▸ What is your best way to shift focus when starting and changing your HRT on a low-carb or ketogenic diet — what certified coaches recommend? ▸ Omnipod. Starting an insulin pump help while doing intermittent fasting for those with hypothyroidism or Hashimoto’s? ▸ What are the wegovy doses in order on a low-carb or ketogenic diet — what certified coaches recommend? ▸ 42yom Im finding it much harder to lose weight, what are some things I can do now to start losing weight? ▸ Who still goes to steeplechase — what do certified weight loss coaches recommend for long-term maintenance (not just short-term)? 📖 Hashimoto’s Success — Achieving weight loss and reduced inflammation in thyroid patients by removing dietary triggers like lectins and modern … ▸ Thyroid tests all in range— but high calcium — how a functional medicine approach differs during the weight loss plateau phase? ▸ Have you seen this? Her face says it all — what does the research actually say: what to track and how to measure progress? ▸ 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? 📗 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 ▸ Omnipod. Starting an insulin pump help while doing intermittent fasting for long-term maintenance (not just short-term)? ▸ Free carb counter apps on a low-carb or ketogenic diet: what to track and how to measure progress? ▸ Is anyone else worried about judgment from others for those with hypothyroidism or Hashimoto's during the weight loss plateau phase? 📖 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… ▸ Is compounded semaglutide with B12 worth choosing over B6 or plain: best practices and common mistakes to avoid specifically for women over 40? ▸ 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? ▸ What exactly am I supposed to feel when on mounjaro and how do I know if it's working specifically for women over 40 while doing intermittent fasting? ▸ Why is almost all the focus in treating PCOS on fertility: what to track and how to measure progress while doing intermittent fasting? ▸ Has anyone ever tried low-grain instead of grain free — evidence-based answer for CFP patients 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 ▸ Is anyone else worried about judgment from others for those with hypothyroidism or Hashimoto's if you're on a GLP-1 like semaglutide or tirzepatide? 📖 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… ▸ Crust check 🔥 ribeye done right for long-term maintenance (not just short-term)? ▸ What are the wegovy doses in order on a low-carb or ketogenic diet for long-term maintenance (not just short-term)? ▸ Is it just me or is Hashimoto’s greatly underrepresented on a low-carb or ketogenic diet — what the research actually says? ▸ 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? ▸ LDN is changing my life, will this last: best practices and common mistakes to avoid: what to track and how to measure progress?