I know that Kevin Mann who swears by finasteride is vegan. I think something like a Mediterranean diet is probably healthiest but vegetarian likely isn't the worst. Vegan too far for me though. Honestly I'm not convinced that diet is huge for hair loss. I think that it's more a combo of genetics and hormones.. my diet has been so much better than most people who have much better hair than me.veganism in a nutshell. mute the music if u can.