One of my ongoing frustrations with many (all) diets and most food news relating to health issues is the prevailing attitude that there is an answer. I… don’t really believe this. Recently, apparently, there’s been a study that actually backs up this belief. You can read all about it in this Washington Post article. (Very short summary: different people respond differently to the same foods, so diets are best when individually tailored.) I really hope to see more of this sort of research in the future.
(I’d also love to see more research relating to the other factors in our lives which lead to different health outcomes – stress, happiness, environment, sleep, etc. – in combination with food studies. We’re complicated beings, after all.)