Expert Q&A

Has anyone with loose skin tried water fasting for long periods of time? and hie did it effect the loose skin: what to track and how to measure progress?

Understanding Loose Skin After Major Weight Loss

Loose skin often appears after losing 30–90 pounds, especially in adults 45-54 dealing with hormonal changes and years of yo-yo dieting. Rapid loss without supporting collagen production leaves excess skin around the abdomen, arms, and thighs. In my 35 years of clinical experience and through the 30-Week Tirzepatide Reset, I've seen that skin elasticity depends on age, genetics, inflammation levels, and how the weight was lost. Water fasting for extended periods is one approach some patients ask about, but it's rarely the best first choice for those managing diabetes, blood pressure, or joint pain.

Effects of Prolonged Water Fasting on Loose Skin

Water fasting, typically 7–21 days consuming only water, can accelerate fat loss but often worsens loose skin initially. During extended fasts, the body breaks down fat quickly, but without protein or nutrients, collagen synthesis slows dramatically. In our clinic, patients who tried multi-week water fasting reported increased sagging in the first 4–6 weeks because autophagy helps clear damaged cells yet doesn't rebuild dermal structure without amino acids and minerals. However, some noted modest tightening after 10–14 days once ketosis deepened and inflammation dropped. The key risk for beginners is muscle loss, which further reduces skin support. Our protocol avoids this by cycling low-dose tirzepatide with lectin-free real foods that supply collagen-building nutrients while still promoting fat loss.

What to Track and How to Measure Progress

Don't rely solely on the mirror or scale. Track body composition weekly using a smart scale or calipers to measure fat vs. lean mass—aim to preserve at least 90% of muscle. Use skin calipers or a tape measure at consistent spots like the lower abdomen (target 1–2 cm reduction monthly). Photograph weekly in the same lighting and pose, noting texture changes. Bloodwork every 8 weeks should monitor electrolytes, protein levels, and inflammatory markers like CRP. In the 30-Week Tirzepatide Reset, we add red light therapy sessions 3–5 times weekly to boost collagen by up to 30% and Japanese-style walking to improve circulation without joint stress. Supplement with our targeted Drops for hunger control and detox to prevent rebound inflammation that stretches skin further.

A Smarter Path: Metabolic Reset Over Extreme Fasting

Instead of long water fasts, the three 70-day cycles in my book integrate chaotic intermittent fasting only in maintenance, paired with 221 lectin-free recipes rich in glycine and hydroxyproline. Patients like John, who lost 40 pounds while reversing diabetes, saw skin improvements without sagging worsening by following the 69 Transformation Steps. Focus on non-scale victories: better-fitting clothes, reduced joint pain, and stable labs. This approach addresses root causes like insulin resistance and toxin burden, delivering sustainable results without the risks of prolonged fasting. Most regain confidence within 12–18 weeks when combining low-dose cycling, real food, and recovery tools.

💬 What the Community Says

Forum users in weight-loss groups are divided on water fasting for loose skin. Many in their late 40s and early 50s report trying 7–14 day fasts after 40+ pound losses, with some noticing slight tightening around week two due to reduced inflammation, while others saw increased sagging and felt weaker, especially those with prior joint issues or blood sugar concerns. A common theme is initial excitement followed by frustration when skin didn't snap back as hoped, leading many to combine fasting with strength training or collagen supplements. Practitioners often share mixed results on measurement methods, praising weekly photos and body-fat calipers but warning against scale obsession. The community frequently debates extreme fasting versus gradual approaches, with a vocal minority praising autophagy benefits yet most agreeing it's tough to sustain long-term and better paired with nutrient-dense refeeding. Experiences with medications like tirzepatide spark curiosity about whether cycling reduces skin problems compared to fasting alone.
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-what-to-track-and-how-to-measure-progress
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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