The food recommendations from the food pyramid or the 4 food groups or whatever paradigm you were taught as a child, arise based on lobbying by lobbyists who represent these groups. They therefore highly advocate for certain products based on what they are selling, not on what is best nutritionally. People involved in this have spoken publicly about this, such as Marion Nestle in *Food Politics*. Basically they say things like meat and dairy have been too much emphasized in order to placate the dairy and meat lobbies.
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