I won't get into a discussion/argument here, because I don't know if vegetarianism would come under breach of the 'theology' rule (mods?). I will provide a basic outline of my reasons for vegetarianism, but that's all, my response addresses counterpoints particularly from my personal perspective only:
Humans have been eating meat for millennia. For millennia before that, many cultures showed some signs of cannibalism. And yet, very few humans are cannibals now. Why? The reasons, I hope, will come instinctively to all of you. In a future world where productivity has continued to grow, people ther may see eating meat as repugnant and disgusting.
All major religions in the world preach basic respect for life, in some form or another, especially the one that's philosophies I'm most sleighted to. Most of these religions don't preach strict vegetarianism, but most of the people they appeal to are not in a position to give up meat, for they will not be able to make up the lost supplements through other foodstuffs. However, people in privileged positions (e.g. people who can buy (or get others to buy them) computers, i.e. us) can obtain the necessary provisions relatively easily.
Many people in our society own pets. Many people cry or are at least momentarily sad when their pets die. If these people (who include me) had to personally kill their own animals (as they have always done before a few hundred years ago) in order to eat meat, I believe they'd eat significantly less meat. The anonymity of battery farming encourages consumption.
Not eating meat has few negative effects on me. I'm not particularly healthy, but my iron levels are just fine. I'm as skinny as a rake.
Several millennia ago, people didn't eat meat from enslaved animals that get crap pumped into them every day. And yes, the drugs can certainly have negative effects. Although there is, as far as I know, no evidence of any bacterial spread from chickens to humans, you can be sure that if one emerges, it won't be good for us at all. Antibiotics have positive effect on the human body only when a particular bacterium is wrecking havoc.
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The book implied that it was happening at that very moment, Stalin was already dead/quite on his way, so that was pretty much void after ww2. And no, the world did not end, so that would be more stuff...
I'm pretty confused about this in general. Was it directed towards 1984?
EDIT: As for caffeine, perhaps the words
'fizzing blue bawls' will enlighten you of my stance towards it
EDIT2: I somehow manage to screw up the URL thingie
every tsingle time. Bah.