I've written a bit about this subject. It's sad and morbid and partisan and I'm probably not going to write these results up formally, but I did take a look at the FAO food use data for subsaharan Africa over the past few years.

fao.org/giews/reports/s…

When you aggregate these reports over time and over countries you get a food use plot that looks like this. Fortunately, it doesn’t look like hundreds of thousands of people have perished in these countries on account of USAID being rolled up. Harjas Sandhu fox