Are you a follower of the diet or philosophy known as vegan?
No, I do not think I could do that at all - I love steak!
Me neither! But vegan diets have benefits. They can reduce the risk of some types of chronic disease.
Yeah I know some people that eat that way for health reasons.  Are there any risks to eating that way?
If a vegan diet isn't properly planned, it can lead to deficiencies in several different vitamins. 
I would imagine it may be hard to try to maintain all the nutrients you would be missing.  Are there other reasons people eat this way?
There are many reasons why people become vegans. One of which is environmental reasons. Environmental vegans avoid animal products on the premise that harvesting or industrial farming of animals ins environmentally damaging. 
Ah that is pretty interesting - what about religious reasons - are any people vegan because of that?
not only follow a vegan diet but extend the philosophy into other areas of their lives, and oppose the use of animals for any purpose. Another term is "environmental veganism", which refers to the avoidance of animal products on the premise that the industrial farming of animals is environmentally damaging and unsustainable.
Well-planned vegan diets are regarded as appropriate for all stages of life, including during infancy and pregnancy, by the American Academy of Nutrition and Dietetics, Dietitians of Canada, Australian National Health and Medical Research Council
physiology, several vegetarian or vegan cat foods have been marketed that are supplemented with chemically synthesized taurine and other nutrients, in attempts to produce a complete diet. Some of these products still fail to provide all the nutrients cats require, and diets containing no animal products pose the risk of causing severe nutritional deficiencies.
Cats do eat grass occasionally. A proposed explanation is that cats use grass as a source of folic acid. Another is that it is used to supply dietary fiber, helping the cat defecate more easily and expel