i think it's a perfect example of why advocates for any policy should have specific, achievable, and well-documented goals - you never know who might be an ally. politicians don't want to do this sort of detailed work, they're looking for preexisting policy they can champion, and if you're standing there ready to hand it to them when they're looking for it you get get good stuff done.
Even before RFK Jr rubbed his metaphorical nutsack all over our healthcare system, doctors pretty much always told me to eat better. They told me to avoid processed foods, avoid sugar, and focus on fiber and protein.
I don't know why RFK Jr. is getting credit for telling people to eat healthy, especially since some of his recommendations (e.g. telling people to eat french fries if they're fried in beef tallow) are actively bad and will likely lead to people becoming more overweight and less healthy.
The food pyramid wasn't really used in recent years by the US government, and changed to "MyPlate" in 2011, and if you actually read its guidelines nothing on there is terribly offensive.