Jody Kriss answered the reason why he preferred to be vegan.
There are a plenty of reasons to want a vegan diet and this blog just attempts to discuss a number of them with you. One great reason is stopping animal slaughter-- not just by not eating meat product but also by not eating dairy products or eggs. There are no retirement homes for dairy cows and egg-laying hens. They all go to slaughter, generally before they've made it to even half their natural life expectancy. There are also ethical problems connected to dairy products and eggs. So as to boost the production of milk, cows are kept pregnant nine months off of each year.