Expert Q&A

Has anyone with loose skin tried water fasting for long periods of time? and hie did it effect the loose skin and its effect on metabolism and insulin levels

Understanding Water Fasting in Midlife Weight Loss

As the founder of CFP Weight Loss and author of The Metabolic Reset Protocol, I've guided thousands through sustainable approaches, especially those in their 40s and 50s facing hormonal changes that make shedding pounds feel impossible. Water fasting—consuming only water for extended periods, typically 3-21 days—has gained attention for rapid fat loss. However, for complete beginners with joint pain, diabetes, or prior diet failures, it's rarely the first choice due to its intensity and potential risks.

How Water Fasting Affects Loose Skin

Loose skin often appears after significant weight loss when skin elasticity diminishes with age, rapid loss, or nutrient gaps. In my experience, prolonged water fasting can worsen loose skin initially because it accelerates fat reduction without building supportive muscle or collagen. Without protein intake, the body may break down lean tissue, reducing skin firmness. Some report modest improvement over months as autophagy (cellular cleanup) kicks in around day 3-5, potentially aiding skin remodeling. Yet, most see better results combining shorter fasts with resistance exercises that fit busy schedules—think 20-minute home sessions to avoid joint strain. Hydration during fasting helps skin plumpness, but don't expect miracles without follow-up collagen support from bone broth post-fast.

Impact on Metabolism and Insulin Levels

Water fasting powerfully resets insulin levels. Studies show insulin drops 50-70% within 24-48 hours as the body shifts to burning fat, improving sensitivity crucial for those managing blood pressure and diabetes. This can break through hormonal weight loss resistance. However, metabolism often slows by 10-20% after 72 hours due to metabolic adaptation, a protective response that conserves energy—exactly why many regain weight post-diet. In The Metabolic Reset Protocol, I emphasize cycling shorter 16-24 hour fasts with nutrient-dense refeeds to prevent this slowdown. Electrolyte balance (sodium, potassium, magnesium) is non-negotiable to avoid fatigue, especially on middle-income budgets without insurance-covered programs.

Practical Guidance for Beginners

Start small: try 24-48 hour water fasts under medical supervision if you have diabetes or blood pressure issues. Focus on rebuilding with strength training 2-3 times weekly to firm skin and boost metabolism by up to 15%. Track progress with measurements over scale weight. My method prioritizes simple, time-efficient meal plans using affordable whole foods to combat overwhelming nutrition advice. Most see sustainable 1-2 pounds weekly loss without embarrassment or complex prep. Consult your doctor before extended fasts to ensure safety with your health profile.

💬 What the Community Says

In online forums like Reddit's r/fasting and r/LooseSkin, users in their late 40s and early 50s share mixed experiences with extended water fasting. Many report noticeable improvements in insulin sensitivity and easier blood sugar control, especially those dealing with type 2 diabetes, but complain of worsened loose skin appearance during the fast due to rapid fat loss. A common theme is initial metabolic slowdown leading to plateaus, with several noting they felt colder and more fatigued after day 5. The community is split on long-term benefits: some praise autophagy for skin tightening over 6+ months when combined with strength training, while others warn of muscle loss making joint pain worse. Beginners often express hesitation about trying it without medical oversight, citing past diet failures and lack of insurance support. Most agree shorter intermittent fasting feels more sustainable for busy schedules than multi-week water 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-and-its-effect-on-metabolism-and-insulin-levels
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.

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