Hair Loss From Weight Loss: How To Prevent It (GLP-1, Ketogenic Diet, IGF-1…)

Why your hair falls out as the weight comes off. The real mechanism
answer — telogen effluvium, dermal adipocytes, IGF-1 suppression,
GLP-1 labels, and a practical protocol. From twelve peer-reviewed
sources. However, if your weight loss is due to illness then that could explain it too. Talk to a doctor.
⚖️ Educational synthesis. Not medical advice. The practical guide is
informed by the studies reviewed above. Talk to a doctor about your
specific situation before changing your diet, fasting routine, or
medication.

⏱ Timestamps
00:00:30 Intro
00:00:55 Telogen effluvium · the framework · BAD
00:01:35 15% baseline · 30% in TE
00:02:10 Why timing matters · the 3-month delay
00:04:33 Kang et al. 2024 · the weight-loss TE cohort
00:04:53 The numbers · 15.21% · 3.54 kg/month · 1.8 lb/week
00:07:54 Goette & Odom 1976 · JAMA crash dieters
00:10:30 The practical risk table
00:12:00 Gupta et al. 2026 · systematic review
00:12:30 Don't read this as direct drug toxicity
00:17:02 The mechanism · dermal adipocytes & free fatty acids
00:17:40 Chen et al. 2025 · Cell paper
00:19:34 The fasting to follicle pathway
00:20:28 Why this isn't just "less food"
00:21:05 The 18% slower growth RCT
00:21:43 The IGF-1 axis
00:21:54 Rahmani et al. 2019 · fasting drops IGF-1
00:24:16 Kazemi et al. 2020 · protein protects IGF-1
00:25:33 Fontana et al. 2016 · CALERIE · bioavailability
00:26:57 Rajakumar et al. 2024 · ketogenic diets
00:27:45 Trüeb 2018 + Laron · IGF-1 in hair
00:29:00 Guo & Katta 2017 · nutrient gaps
00:29:35 The paracrine follicle niche
00:30:05 The cumulative stack
00:30:40 Practical thresholds
00:31:05 Fixation vs real biology
00:31:20 The protocol · DO / DON'T / WATCH
00:31:59 Closing

📊 Key numbers
• Telogen: about 15% baseline to 30%+ in TE
• Risk zone: 10–15% body-weight loss · around 1.8 lb / 0.8 kg per week or faster
• Onset: 2–3 months after the stressor
• Fasting drops IGF-1 by about 28.87 ng/mL · Rahmani 2019
• Keto lowers IGF-1 about 20%, insulin about 29% · Rajakumar 2024
• 10-day RCT · 18-hour fast slowed human hair growth about 18%

📚 Sources
BAD · Telogen effluvium PIL
https://www.bad.org.uk/pils/telogen-effluvium/

Kang DH et al. Ann Dermatol 2024 · vol 36, issue 6, pages 384–388.
https://pubmed.ncbi.nlm.nih.gov/39623615/

Goette DK, Odom RB. JAMA 1976 · vol 235, issue 24, pages 2622–2623.
https://pubmed.ncbi.nlm.nih.gov/946869/

Chen R et al. Cell 2025.
https://pubmed.ncbi.nlm.nih.gov/39674178/

Gupta AK et al. GLP-1 therapies and hair loss · systematic review.
2026.
https://pmc.ncbi.nlm.nih.gov/articles/PMC13100445/
Rahmani J et al. Ageing Res Rev 2019 · vol 53, article 100910.
https://pubmed.ncbi.nlm.nih.gov/31116995/

Kazemi A et al. Clin Nutr 2020 · vol 39, issue 6, pages 1705–1716.
https://pubmed.ncbi.nlm.nih.gov/31431306/

Fontana L et al. Aging Cell 2016 · vol 15, issue 1, pages 22–27.
CALERIE.
https://pmc.ncbi.nlm.nih.gov/articles/PMC4717266/

Rajakumar HK et al. Ageing Res Rev 2024.
https://pubmed.ncbi.nlm.nih.gov/39396675/

Trüeb RM. Skin Appendage Disord 2018 · vol 4, issue 2, pages 90–95.
https://pmc.ncbi.nlm.nih.gov/articles/PMC5939720/

Lurie R, Ben-Amitai D, Laron Z. Dermatology 2004 · vol 208, issue 4,
pages 314–318.
https://pubmed.ncbi.nlm.nih.gov/15178913/

Guo EL, Katta R. Dermatol Pract Concept 2017 · vol 7, issue 1, pages
1–10.
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5315033/
#HairLoss
#HairScience #Trichology #IntermittentFasting #WeightLossJourney
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