This is an old resurrected thread, so a context review is in order before I respond: I was explaining that almost nothing humans eat today is a result of natural selection, but it has in fact all been genetically modified by us, via hybridization / selective breeding, mutagenesis, now transgenic processes etc. FL said I was simply incorrect about that. Let me offer one simple, visual example.
Both of these photos show corncobs. One is in my palm, for scale. You'll note that these cobs are quite small compared to what we know as corn today. That's because they're almost 1,000 years old, found in an ancient Ancestral Puebloan granary on a cliff in northern Arizona.
These folks were farmers. This tradition of cultivating maize had moved up from Central America over the previous few thousand years, and naturally they were always working towards bigger yields.
Compare these cobs to the corn we have 1,000 years later. Then, compare it to the head of a mountain varietal teosinte plant - the grass that corn came from.
These cobs are roughly halfway in size between teosinte and modern corn. That's genetic modification in action; hard to think of a clearer example.
Basically ALL of our food chain today has been genetically modified, one way or another.