I discovered I was deficient in a multitude of different nutrients that are readily available in animal products. (b12, zinc, iron, magnesium, vit D, Retinol Vit A). I also found out I had hypothyroidism, and when I did some research I found the link between raw cruciferous vegetables and soy blocking thyroid function. Protein and pre-formed Vitamin A from animal products are critical for thyroid health. When you have a slow thyroid you cannot convert beta carotene into Retinol Vitamin A, the form you need for healthy thyroid function.Entire interview.
Oh, and one more thing: Why do vegans eat fake meat? You don't see carnivores eat fake vegetables. Honest question.