Hair shedding after weight loss is common, whether the weight loss came from dieting, weight-loss medication or bariatric surgery. It is usually temporary and related to how quickly weight is lost and how well the body is nourished during that time. This guide explains why it happens and what helps.
Why it happens
- Rapid weight loss is a physical stress that can push many hairs into the resting phase at once. They shed together a couple of months or more later, a pattern called telogen effluvium. See telogen effluvium.
- Low protein or calorie intake can leave hair follicles short of what they need.
- Nutrient deficiencies, such as low iron, zinc or other nutrients, are more likely with restrictive eating or after surgeries that reduce absorption. See iron deficiency hair loss.
Weight-loss medications and surgery
People using GLP-1 and similar weight-loss medications have reported hair shedding. Current thinking is that this is mainly related to rapid weight loss and reduced food intake rather than a direct effect on hair, but research is ongoing. Shedding is also common in the months after bariatric surgery. In both cases, your prescribing doctor or surgical team should be your first contact, and they may check nutrient levels.
What is typical
Shedding related to weight loss often settles once weight stabilizes and nutrition is adequate, and new growth follows slowly. If thinning continues, or hair does not return to its previous fullness, other causes such as pattern hair loss should be considered.
What helps
- Enough protein spread through the day, as advised by your doctor or dietitian.
- A balanced diet, and supplements only as recommended, especially after surgery.
- Blood tests if shedding is heavy or prolonged, commonly for iron and thyroid.
- A steady pace of weight loss, agreed with your care team.
- Gentle hair care to limit breakage.
A note on your wellbeing
If weight loss is coming from severe food restriction, or you are worried about your relationship with food, please talk to a doctor. In the US, you can also contact the National Alliance for Eating Disorders helpline at 1-866-662-1235 for support.
When to see a doctor
See a doctor for heavy or prolonged shedding, patchy bald spots, scalp pain, or symptoms such as fatigue, dizziness or brittle nails.
Next step
If weight has stabilized and you want a licensed provider to review ongoing thinning, start your online consultation.
Prescription required for prescription treatment. A licensed provider decides whether treatment is appropriate. Individual results vary. Prescribed Essence currently serves patients in California, Colorado, Florida and New York.
