I understand why people are leaning towards a vegetarian lifestyle, but it is not necessary for optimal health. I am not exactly sure WHY people make this poor assumption and why advocates push it like it is the BEST diet for optimal health when it simply is not necessary. The 2 cultures with the longest life expectancy are Okinawans and Aborigines. And although their meat, fish, and poultry intake are about a fourth of what Americans (who eat meat,fish, and poultry) is. They still DO consume them. What seems to be the deciding factors in their diet are...they eat small meals many times a day. They limit their caloric intake. Their diets are low in fats and high in fiber. They consume ALMOST NO refined/processed foods. With the exception of those things everything else goes. So, for those who want to obtain a good quality of life for the longest time possible, I would follow the lead of those who are achieving these results. And this seems to say that meat, fish, and poultry are fine in moderation and the right proportion.