A student in my class this spring wrote a paper on food waste, and I wanted to highlight a few key pieces of literature. First is this piece about food recycling in Korea, which has a stunning 95% recycling rate for food. For a country that is famous for filling restaurant tables with little "Banchan" dishes that aren't ordered, this is a pretty impressive development!
A leading voice among economists who are interested in food waste is Prof. Marc Bellemare; here is a 2018 blog post. He basically contends that food waste isn't really worth getting too excited about.