I'm 25, female, 5'8'', 135 pounds. Fully veggie since September 2009 (no problems, weight didn't even change), vegan since february 2014.
I supplement pretty regularly (4-7 times a week) with Iron, B12, Zinc, DHA (have been since 2009), and now also B-complex, Magnesium & Calcium, and D based on Pharmacist recommended levels after I explain my diet to them. I eat a salad daily (1.5-2.5 cups greens) with 50/50 baby lettuce and spinach, spring mix, spinach or romaine and went through a kale phase as well.
None of the women in my family have hair loss like this. My mom loses a bit of hair near her hairline but it grows back in the winter. No one gets effluvium all over like this so I doubt it's hereditary.
The main concern is my family friends' kids went vegan together and lost their hair so everyone was warning and scaring me that I was going to lose all this hair. They ended up quitting and it grew back (could have been the effluvium had already stopped). Now that it is actually happening to me it's worrying
I have read online that your body sometimes reacts to a vegan diet as if it is a crash diet because there's so much change (I went whole foods at this point as well from a pretty western diet and may have lost some fortified foods or vitamin sources). Also the low-cal and weight loss also came up a lot as causes on omni forums.
I will book an appointment to get my blood results back next week so I can check the D, Iron and thyroid levels you mentioned. I think they were all tested. I'm pretty confused at this point but any help is greatly appreciated