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These dietary guidelines are not published by the FDA, whose goal is to protect public health, but by the USDA, whose goal is to protect farmers.

Compare their "about us" pages:

FDA:

"The Food and Drug Administration is responsible for protecting the public health by ensuring the safety, efficacy, and security of human and veterinary drugs, biological products, and medical devices; and by ensuring the safety of our nation's food supply, cosmetics, and products that emit radiation."

USDA:

"We have a vision to provide economic opportunity through innovation, helping rural America to thrive; to promote agriculture production that better nourishes Americans while also helping feed others throughout the world; and to preserve our Nation's natural resources through conservation, restored forests, improved watersheds, and healthy private working lands."

https://www.fda.gov/about-fda/what-we-do

https://www.usda.gov/our-agency/about-usda