IMO the criterion to compare by should be protein content (also taking into account the https://en.m.wikipedia.org/wiki/Biological_value https://en.m.wikipedia.

IMO the criterion to compare by should be protein content (also taking into account the https://en.m.wikipedia.org/wiki/Biological_value https://en.m.wikipedia.org/wiki/Biological_value) rather than calories. For most people suffering from malnutrition worldwide their biggest problem probably isn't getting enough calories but rather getting enough protein and vitamins and so on. Getting calories in the rich countries is more of an anti problem. Many people take in too many calories, because there's too little protein in the foods they eat (so they have to eat more of it, giving them too many calories). Protein dilution.