““The only nutrients lacking in a vegan diet are vitamin B 12 and the long-chain omega-3 fatty acids EPA and DHA. One should also consider supplementation with iodine and vitamin D, depending on one’s exposure to sunshine and consumption of seaweed for iodine. The amount of zinc might be somewhat suboptimal with a vegan diet because of zinc binding by phytates in plants, but otherwise, animal products don’t provide anything that you can’t get in a safer package—from consuming plant foods. So eat less animal products—consider hardly eating them at all—for the best health and then supplement wisely and conservatively to make up for any insufficiencies.””