"Then, one day, an unusually tasty dish appeared, which brought back vivid memories of the deer - hunts and barbecues of his youth. However, there was something unfamiliar about both flavour and texture, so Poole asked the obvious question. Anderson merely smiled, but for a few seconds Indra looked as if she was about to be sick. Then she recovered and said: 'You tell him - after we've finished eating.'... 'Corpse-food was on the way out even in your time,' Anderson explained. 'Raising animals to - ugh -eat them became economically impossible. I don't know how many acres of land it took to feed one cow, but at least ten humans could survive on the plants... And probably a hundred, with hydroponic techniques. 'But what finished the whole horrible business was not economics - but disease. It started first with cattle, then spread to other food animals - a kind of virus, I believe, that affected the brain, and caused a particularly nasty death.... Synthetic foods were now far cheaper, and you could get them in any flavour you liked. p.32 -33"
January 1, 1970
https://en.wikiquote.org/wiki/Arthur_C._Clarke