Yeah, that's the only thing rock solid. That said, and contrary to popular opinion, the recommendations haven't changed too much. There's been quite a bit of m

Yeah, that's the only thing rock solid. That said, and contrary to popular opinion, the recommendations haven't changed too much. There's been quite a bit of misinformation (eg. 90's food pyramid), but reputable professionals have been pretty close. I'm not sure on the history, but I think there we've semi-recently found that carbs can be less healthy than we initially thought, and the story with fat is pretty complicated (vs. all fat being bad). I'll put this another way. If you had followed recommendations as far back as the 60's you should be perfectly fine. You would be reducing sugar, and eating lean meats, and plenty of fruits and vegetables. You might even be eating less refined carbs (although that could be a newer discovery). People are simply off base to claim that we don't know what we're talking about and the recommendations change constantly. I'm sure you can find some shifts in recommendations, but you've always supposed to eat plants, and watch fats and sugar... I think even some of the ancients knew this.