Some diabetics experience hair loss while losing weight, but the hair grows back when weight loss evens out and stops. This is because of a change in hormones (and frequently happens also in postpartum women and menopausal women). Some have found biotin (vitamin B7) to be of help in hair regrowth.

References

WebMD Medical Reference; reviewed by Debra Jaliman, MD. “Alopecia Areata,” WebMD (September 5, 2018). https://www.webmd.com/skin-problems-and-treatments/guide/alopecia-areata#1 (accessed on 8/1/2020).

Type 2 Diabetes Hair Loss – Possible Causes
https://www.type2diabetesguide.com/diabetes-hair-loss.shtml#.WI5PVRkrKUl

Can low-carb diets result in hair loss?
https://www.dietdoctor.com/can-low-carb-diets-result-in-hair-loss

The Best Natural Hair Loss Remedies
https://draxe.com/hair-loss-remedies/

Does amla oil really work?
Amla oil is a natural remedy prepared from the fruit of the Indian gooseberry tree, Phyllanthus emblica. Amla oil is most commonly used to promote hair and scalp health, but amla oil has many other uses.
https://www.medicalnewstoday.com/articles/320709.php

Does peppermint oil work for hair growth?
https://www.medicalnewstoday.com/articles/319397.php?iacp

Can I Use Castor Oil for Hair Growth?
https://www.healthline.com/health/beauty-skin-care/castor-oil-hair-growth

Biotin for Hair Growth: Does It Work?
https://www.healthline.com/health/biotin-hair-growth