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It will be interesting to see how the arguments against meat eating survive against artificially grown meat, which will certainly be a reality in less than ten years. It hard to argue that taking a few cell sample to use to grow just meat masses that have no attached brain is cruel, and it's a good bet that the packaging conditions will be more sanitary than todays (no feces to contaminate the meat). Will they be reduced to the feeble "but, but, it's not natural"?
Really at that point is there a difference between artificial meat and all the crap they add to textured vegetable protein to simulate "meatiness". I ask this as someone who has on and off flirted with a vegetarian diet over the years, yet avoided the TVP stuff since a quick read of the ingredient revealed more food science (read voodoo) than anything else on the shelf.
Maybe the argument will simply move to whether or not it's morally acceptable to eat artificially grown meat from human muscle tissue samples.