For me it is slightly irrelevant for many of us, because who can prove that just because these foods when burned, raise the temperature of water in the same ratio or way that your body uses the energy from the foods? I think calories has led us down the garden path in the sense that we don't really know how to feed ourselves in the perfect way. Once again so many variables and many I know don't even have the tools to work anything out themselves. And of course the powers that be are quite happy that people are confused. If this wasn't true then hospital food wouldn't be how it is. Probably haven't answered the question, sorry.