I think there might be a big difference per country in how much is thrown away. At home, half a plate if unfinished food.. or in supermarkets, stuff that is on their "best before" (which sometimes is still good for months...)
I expect rich countries to be much more wastefull and careless. Though slow but steady there becomes awareness of the millions of pounds of good supermarket food that goes straight to the landfill. Not to mention stupid stuff like not straight cucumbers... (ok I can see there can be made a lot of jokes about that now haha)
still I think minimum average elevation would be more fun/makes more sense. Then you can think about countries that are low. Instead of happening to know 1 specific point some country.