Diets are not a "little discomfort in the short term" and treating them in such a way is a slippery slope to things that neither you nor i would be happy to observe. To adopt a particular diet means to be reliant on a specific set of foods, which is not feasable. Diets are also geographical and are shaped by the conditions that those who follow the diet have to live in. It's not as easy as "just don't eat meat".