A vegan diet can potentially lead to hair loss due to nutrient deficiencies or hypothyroidism from excessive isothiocyanates.

“the first was that he noticed that his hair was coming out in clumps in the shower that he was actually shedding hair in the shower which was probably some combination again this is an anecdote this isn't that of one but anyone that's listened to this podcast for any amount of time will know that i have major concerns about plant-based diets long-term and nutrient deficiencies but this could have been evolving hypothyroidism in him due to too many isothiocyanates or inadequate iodine absorption in conjunction with excess vegetables could have been overall nutrient deficiencies”