I was wondering this morning about when did food production start to go wrong. I've only done a little reading with Wikipedia being my jump off point, but I thought I'd share two links:

Factory farming - Wikipedia, the free encyclopedia
Concentrated Animal Feeding Operation - Wikipedia, the free encyclopedia

One thing I found interesting from a perspective pov:

Livestock production has become increasingly dominated by CAFOs in the United States and other parts of the world. Most of the poultry consumed by humans was raised in CAFOs starting in the 1950s, and most cattle and pork originated in CAFOs by the 1970s and 80s. CAFOs now dominate livestock and poultry production in U.S. and the scope of their market share is steadily increasing. In 1966, it took one million farms to house 57 million pigs; by the year 2001, it only took 80,000 farms to house the same number of pigs.
If I read that correctly, we're raising the same number of pigs on fewer than one tenth the number of farms. That was a bit startling.

It almost makes me think that we don't have to go all the way back to Grok - 50 or 60 years ago, just about all four legged farm animals were grass fed.