"Scientists and dietitians are starting to agree on a recipe for a long, healthy life."
The body is one of the most complex systems we know of and people keep claiming "Ah i am an expert i know how this works" it is pure insanity.
On top of that we are all individuals and we all work differently. I find it likely that we wont find a single truth about the food we eat, and what food gives best human performance.
What we will find is statistics, this food is 90% likely to be good for a human being. Or eventually some sort of functional description that allows us to figure out what food is "good" for what people. Probably based on genetics or some sort of individual testing.