No one listens to government "guidelines" in private life. They could easily add alcohol and sugar to the list and it wouldn't effect behavior at all.
Took a long time to realize just how bad the food pyramid was.
Keep in mind that lactose intolerance isn't evenly distributed across the globe. People of Northern European extraction have the lowest rates, so the Standard American Diet overlooking or ignoring other extant USAian groups' dietary needs and constraints from consideration (however numerous they may be among the US' population) shouldn't be too startling.