Nutritional guidelines are developed by USDA.
This newest iteration appears to have had input from HHS under RFK Jr: https://www.nbcnews.com/health/health-news/us-dietary-guidel...
This also appears to be from USDA, as per their other website with the same info: https://www.dietaryguidelines.gov/
My point really was that it seems odd that this information isn't readily available on the website. Why hide it?