Some people have found that animal meat and byproducts don't fit
their lifestyle, whether it is for spiritual, health, or other
reasons. They remove these products from their life, and find better
health or happiness as a result. Some are known as 'vegetarians', and
choose not to eat meat, but will often consume dairy products and
other animal byproducts. Others, known as 'vegans', choose not to eat
any foods in which an animal has been consumed in any way. They do
not eat dairy, and many even abstain from whey products.
Bodybuilding is known for its rigorous physical demands and enormous
meat consumption. What happens when a bodybuilder determines that a
vegan or vegetarian lifestyle is right for him/her? How should he
make the transition? Are there any long-term pitfalls of which he
should be aware?
Make the change gradually
If you've been consuming two pounds of meat and 4 protein shake a
day, changing over to a meatless diet overnight will be have a
tremendous negative impact on your body. Remove meat slowly, perhaps
scaling down to fish only for a week. Then remove whey protein, if
going completely vegan. Take two to four weeks to make the complete
transition....

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