I think this article also does a good job in emphasizing country-level poverty is what's really important to think about. That is, in the US, since we already have the infrastructure of a rich country, even poor people can afford safe food and refrigeration (but even then it's not evenly distributed, e.g. much has been written about "food deserts" in the US).
But, in say, Nigeria, they are so undersupplied with refrigeration trucks that making it possible for the poor to get reliable access to safe food would take a massive investment, which would mean a lot more energy.