Not sure if this is the right subreddit for the question, but I'll give it a shot.
I believe that aside from the U.S., India and China are and have historically been the largest food exporters in the world, and more so post Green Revolution.
Now that these countries are replacing agriculture with industrialization, will there be a decline in global food output?
This would be better suited to /r/AskEconomics. I am an undergraduate student of Economics, and I would be glad to answer your question to the best of my ability on that subreddit.