Witchy, when I got to my lowest weight 2 years ago, my hair had stopped growing by the end of my 8 months of dieting. I didn't notice it falling out (thank goodness, it's quite fine to begin with), but it definitely slowed/stopped growing, as did my fingernails. I went to the hair stylist shortly after and mentioned that I thought it hadn't been growing well and I had lost a lot of weight, and I don't remember exactly what she said but she did agree. By about 6 months later, it had started again. My stylist said "It's really growing in well now. You've got a lot of new growth back here!" (indicating section in the back of my head). I had also gotten as low as I could go "healthily" calorie-wise, ~1200/day, and was probably low in fat. I took a multivitamin and calcium supplements but I'm betting I was nutrient deficient too.
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