The one bible passage that you'll never here an Adventist quote is this one.
Now the Spirit speaketh expressly, that in the latter times some shall depart from the faith, giving heed to seducing spirits, and doctrines of devils; Speaking lies in hypocrisy; having their conscience seared with a hot iron; Forbidding to marry, and commanding to abstain from meats, which God hath created to be received with thanksgiving of them which believe and know the truth. For every creature of God is good, and nothing to be refused, if it be received with thanksgiving: For it is sanctified by the word of God and prayer. 1 Timothy 4:1-5There is another verse also that could be interpreted as condemning vegetarianism, but I wasn't clear that that was the intent of the verse after reading it in context (Romans 14:2). However the one above most certainly does condemn vegetarianism and also celibacy.
Even in the bible, christians can't keep their dogma off of everyone else's lifestyle choices. Yep, it's in The Bible!