I think post is pointing out that the foods haven't been tested to reduce chronic disease directly. The assumption that they would is because they have certain

I think post is pointing out that the foods haven't been tested to reduce chronic disease directly. The assumption that they would is because they have certain nutrients, and consumption of those nutrients has been associated with a risk reduction. BWT, density can be defined as nutrients per kg or per cal, when defined per cal this is what you get.