Consider that killing a living thing to eat its body is not unique to "meat", nor is raising it in a controlled environment for the purpose of consumption. Fish (as is sometimes classified separately) and vegetables are living things raised and killed for consumption of their bodies as well.

I believe reconciling all of these as ethically equal (including raising the ethical weight of killing a plant as equal to an animal) is important for sanely dealing with our natural ecosystem of food. The "aliveness" of plants is continually researched and shown in a positive light, and it's hard to draw a clear and reasonable line between "life that is acceptable to eat" and "life that is not acceptable to eat".

When you look at the spectrum of life and how ethically impactful killing it for food is, it tends to follow anthropomorphism and social compatibility with humans, which doesn't seem objective enough to be pursued for widely-accepted ethics, but merely for local cultural acceptability.