The global food supply chain is significantly more complicated than it was a few generations ago. Some of it is due to technological progress, but sometimes it's due to greed and/or pollution. Eliminating waste and making food processes as efficient as possible sounds like a admirable goal, but the food products created at the end of the day should be appetizing... and, more importantly, safe to eat. If you're not too squeamish, check out these links on food that might churn your stomach.
If you'd like to read more awesome and interesting stuff, check out this unrelated (but not entirely random!) Techdirt post