The Vegan Diet is a practice in Compassion.
The less animal products you eat, the less there is a need to kill animals for food, extract their milk and harvest their eggs.
And given that your reason for going on a Vegan Diet is to lose weight and become healthier, then those are reasonable enough reasons to follow this lifestyle.
I wouldn’t call it a diet like the South Beach Diet or the Atkins Diet, but rather a lifestyle that is well suited for one practicing Yoga, because of Yoga’s emphasis on ahimsa (showing compassion for other living creatures).
Many critics often reason that plants are living things and killing them for food is the same thing as killing animals for food. Trust me, they are not the same thing if you’ve seen how animals are slaughtered. But on the other side of the coin, what more that we have to kill plants for food when the slaughtering of animals is a more brutal event?
Logic tells us that the Vegan Diet is the more compassionate diet, and that is one of the big reasons for going Vegan, for the compassion and love for all animals.
Above is a nice video for transitioning to a Vegan Diet.