I’m not an avid meat-eater, never have been, (I remember as a child not being allowed to get down from the table until all my meat had been eaten - luckily, if I could slip it to him, my brother would wolf it down.) and we often eat vegetarian food. I usually make vegetarian choices when I’m out, as well.
Coincidentally, last night I was talking to a high-level academic in the field of nutrition. She has decades of experience and in her opinion, veganism is unsustainable, for the whole world. That’s not because of the diet itself, although she said it does take careful planning, but because eventually the soil will become degraded without being renewed by animal manure. It would mean using chemicals instead and planting GM crops along with pesticides to be able to grow enough for everyone.
I thought she was very interesting, it’s certainly made me think!