There's a new edition of the Food Pyramid and it is close to a total inversion of the one I remember from high school.
Meats, proteins and healthy fats (yes, including butter!) are back on top, and grains are at the bottom.
The new pyramid probably doesn't go as far as it should in resuscitating the reputation of butter and other 'healthy-again' fats, but it's a definite improvement over the last 30 or so years of recommendations.
A low carb diet is recommended, but it doesn't quite endorse the keto plan.
This page is kind of busy, but eventually you can get to the food pyramid on it:
https://realfood.gov/