Asking the Unthinkable

This question has been on my mind for many years and I've finally decided it's time to ask it.

What do OPIs eat? Has anyone ever heard of an insider mention this? If we are truely getting technology to aid mankind from benevolent ETs then why haven't we even heard rumors about more productive and efficient ways to feed our populations? These questions have been bothering me quite a bit lately. Anyone care to take a stab at them?