Why It Happens
Rapid weight loss shifts a higher proportion of hair follicles into the resting (telogen) phase. Reduced calorie and protein intake, low ferritin, zinc, vitamin D or B12, and surgical stress can all contribute.
Typical Timeline
Shedding usually begins between months 2 and 4 after surgery and improves over 6–12 months as weight loss stabilises and nutrition normalises. New hair growth is generally already in progress when shedding peaks.
Nutrients to Monitor
Protein intake (typically 60–80 g/day, individualised)
Iron and ferritin
Zinc
Vitamin D and B12
Biotin only if a documented deficiency exists
What Actually Helps
Reaching daily protein targets, taking the prescribed multivitamin and minerals, attending follow-up labs, and avoiding crash diets matter more than over-the-counter hair products. A dermatology referral is reasonable when shedding is severe, asymmetric, or persists beyond 12 months.
References
- Mechanick JI et al., 2019 Update — Perioperative Nutrition Guidelines for Bariatric Surgery
- ASMBS Integrated Health Nutritional Guidelines
This content is for general information only; it does not replace an examination, diagnosis or treatment.
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Medical content editor: Op. Dr. Gökhan Ateş — Specialist in General Surgery
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