Comment by seec

Food supply is something I though about but the problem is that we put a lot of it in storage and it's never clear how much because sellers may want to wait until markets are more favorable.

With modern technology/knowledge, we have a lot of high-density calories lying around, in the form of grains, potatoes, oils, etc.

It might be possible to get a rough picture tracking the perishables that are often animal products but poor countries don't use a lot of it because, well, they are poor. So it makes everything very complicated.