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I have always been an anti-vegetarian, anti-vegan proponent. It was very satisfying while driving home when I heard an interview on the radio with Lierre Keith, author of The Vegetarian Myth: Food, Justice, and Sustainability, who spoke about how she became very ill from having a diet free of animal products.  Her doctor told her she had to change her eating habits and incorporate animal based products if she wanted to be healthy again. The bottom line is you cannot get the nutrition you need to be healthy by not eating animal products. B-12, Creatine, Carnosine, DHA,  and Vitamin D3 are only derived from eating animal products and are imperative for brain function. Sure you can take supplements but they do not absorb the same as getting it from the source.  I am no doctor by any stretch of the imagination but I know from my doctors, friends who have experienced it for themselves and now others that are beginning to tell their story like Lierre Keith that not eating a balanced diet incorporating animal products is a path to malnutrition and an unhealthy life.