Here's industry reports
https://www.nationalbeefwire.com/doctors-group-applauds-comm...
https://www.wattagnet.com/business-markets/policy-legislatio...
And straight up lobbying groups
https://www.nationalchickencouncil.org/new-dietary-guideline...
https://www.meatinstitute.org/press/recommend-prioritizing-p...
Lobbying groups, putting out press releases, claiming victory...
Here's some things you won't find in any of the documents, including the PDFs at the bottom: community gardens, local food, farmers markets, grass fed, free range... Because agribusiness doesn't make money with those.
Just because you might like the results doesn't mean they aren't corrupt as hell
The original food pyramid was based on a world crafted by calory deficit and worked for it's time, but in a life of excess it causes mass obesity which is partly why americans are so fricking fat.