There was a scifi novel in the olden days that had exactly that scenario: A fast spreading disease that first took out rice, which lead to mass starvation and politicla unrest in Asia. This was countered by sending food from the US and Europe, depleting their reserves. Then, the next year, the virus (or whatever) made the jump over to all members of the oryzee family, i.e. all cereals, worldwide. No wheat, no barley, no maize - all dead except a few plants kept safe in secure labs.

Not to scare you but it happens every year, constantly. There is always another new disease or an new mutation to an older disease that is attacking crops.

It's only by constant research, phytosanitary processes and breeding efforts that our food supply is as secure as it is.

I mean, just look at the potato famine, that was on par with any pandemic.

I meanbstuff like that exists, ergot for example really sucks. But you can kill and burn infected plants and animals. Can`t really do that with humans. So it is overall much easier to controll.

Edit: Some weird formating stuff

I really don't remember well anymore right now, but there was some infection 2 years back or so, where if you had it, you couldn't process some kind of meat/any meat anymore.

heard diesel is like a few thousand calories, so we could maybe switch to that

I will not think about this further, I feel light headed