> I'm 42 and this is what the USDA has been saying all along with their food pyramids and four food groups and what have you. You are not remembering correctly

> I'm 42 and this is what the USDA has been saying all along with their food pyramids and four food groups and what have you. You are not remembering correctly. https://en.wikipedia.org/wiki/History_of_USDA_nutrition_guides https://en.wikipedia.org/wiki/History_of_USDA_nutrition_guid... > I think as a whole, nutritionists have always been on the same page, No, they certainly haven't. "Best practices" change all the time. This happened quite recently; http://articles.mercola.com/sites/articles/archive/2015/06/15/2015-dietary-guidelines.aspx http://articles.mercola.com/sites/articles/archive/2015/06/1... > but the edict "Eat food. Not too much. Mostly plants" doesn't concern itself with those It also contradicts the recently popularized "keto" diet, which has roughly as much evidence behind it as any other popular dietary recommendation (i.e. not much). Really the only things we can say authoritatively is "if you miss out on certain nutrients, you get sick". Beyond that, we're not really very sure. > The problem is separating the wheat from the chaff Your mistake is in thinking that there's a definitive difference. Almost ever piece of nutritional research available today has an extremely low predictive power. Where you draw the wheat/chaff line is more or less arbitrary. Even what should, ideally, be the most staunchly scientific food-related organizations, the FDA and FNS, change the recommendations all the time because they're not actually using hard science.