Expert Q&A

Has anyone with loose skin tried water fasting for long periods of time? and hie did it effect the loose skin when you have PCOS or hormonal imbalances for those with hypothyroidism or Hashimoto’s?

Understanding Loose Skin and Water Fasting

Loose skin often appears after significant weight loss, especially when fat is lost faster than collagen production can keep up. In my 35 years of clinical experience and through the 30-Week Tirzepatide Reset, I’ve seen patients with PCOS, hypothyroidism, and Hashimoto’s struggle with this. Water fasting for extended periods—typically 5–21 days consuming only water—triggers autophagy and ketosis, which can accelerate fat loss but rarely improves skin elasticity on its own.

During prolonged water fasting, the body breaks down fat stores rapidly, but without adequate protein, collagen synthesis slows. This can worsen the appearance of loose skin, particularly around the abdomen, arms, and thighs. For those with hormonal imbalances like PCOS or Hashimoto’s, fasting adds stress that spikes cortisol, further disrupting thyroid function and insulin sensitivity.

Effects on Hormonal Conditions

Women with PCOS often report mixed results. Short water fasts under 72 hours may reduce inflammation and improve insulin resistance temporarily, but longer fasts frequently exacerbate fatigue, hair loss, and irregular cycles due to lowered leptin and thyroid hormones. In hypothyroidism and Hashimoto’s cases, extended fasting can suppress T3 conversion, slowing metabolism by up to 20-30% in some patients I’ve monitored. This rebound often leads to weight regain and more pronounced loose skin once normal eating resumes.

Our protocol in The 30-Week Tirzepatide Reset avoids these pitfalls by using low-dose tirzepatide cycling alongside a lectin-free, low-carb diet rich in collagen-supporting nutrients like bone broth, vitamin C from peppers, and targeted Detox Drops. Japanese-style walking intervals and red light therapy sessions stimulate skin tightening far more effectively than extreme fasting.

Safer Alternatives for Skin Tightening and Metabolic Reset

Instead of water fasting, focus on controlled caloric deficits with 1.6–2.2 grams of protein per kg of ideal body weight daily. This preserves muscle and supports fibroblast activity for better skin retraction. Add 10–15 minutes of daily red light therapy at 660–850nm wavelengths, which increases collagen density by 30–40% in studies I reference with patients. For those with joint pain or diabetes, our chaotic intermittent fasting in the maintenance phase—eating within a 10-hour window 4–5 days per week—delivers similar autophagy benefits without the hormonal crash.

In the book, the 69 Transformation Steps guide you through three 70-day cycles that address root causes: reducing lectin-driven inflammation, clearing toxins with Brown Detox Drops, and rebuilding mitochondrial function. Patients following this lose 30–90 pounds while seeing measurable skin improvements through body-composition scans showing increased lean mass.

Real Patient Outcomes and Next Steps

Consider Laura, who had Hashimoto’s and 35 pounds of loose skin after prior yo-yo diets. She skipped water fasting, followed our exact protocol with one box of cycled tirzepatide, and after 30 weeks maintained her results for 18 months. Her skin tightened noticeably around month 18 as thyroid antibodies dropped 60%. John, managing diabetes and PCOS-like symptoms, lost 40 pounds without loose skin worsening by prioritizing real foods and recovery over extremes.

Sustainable success comes from metabolic freedom, not medication dependency or prolonged fasting. The 30-Week Tirzepatide Reset gives you the tools to reset hormones, tighten skin naturally, and keep weight off. Start with our lectin-free meal plans and simple daily habits—no complex schedules required.

💬 What the Community Says

The community shows a mix of curiosity and caution around water fasting for loose skin, especially among those with PCOS, hypothyroidism, or Hashimoto’s. Many in 45-54 forums report trying 5–10 day water fasts and seeing minimal skin improvement, with some noting increased sagging due to rapid loss without strength training. A vocal minority with milder PCOS claim reduced inflammation and slightly firmer midsections after repeated short fasts, but most with Hashimoto’s describe worsened fatigue, cold intolerance, and stalled thyroid labs that made loose skin feel more noticeable. Debates frequently center on whether autophagy truly tightens skin versus simply masking it through further fat loss. Practitioners often share that insurance barriers and joint pain push people toward fasting as a “free” option, yet lived experiences highlight rebound weight gain and hormonal crashes. Overall sentiment leans toward seeking gentler protocols like low-dose cycling and nutrient-dense eating rather than extended water-only periods, with users swapping stories of better non-scale victories from walking routines and red light therapy.
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-when-you-have-pcos-or-hormonal-imbalances-for-those-with-hypothyroidism-or-hashimoto-s
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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