I have heard of hair loss happening from weight loss, but unfortunately I have never lost enough weight to cause it myself. I thought it was from lack of protein/nutrients but here is something I found online about it.
A more likely cause of hair loss with weight loss is "telogen effluvium.". The stress to one's system from sudden or excessive weight loss can throw hair follicles into their resting phase. This is when many hairs are shed. Other stressors -- high fevers, childbirth, surgery -- can lead to telogen effluvium.
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