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.
Sure he may be a meathead moron who can only advocate that the military should get jacked, but if the military really DOES need to get in better shape and his brainiac predecessors weren’t actually doing anything about that, he’s actually functionally smarter than them.
So to answer your question, if RFK is doing the thing that needs to be done, he should get the credit.
The food pyramid was removed in 2011 and replaced with MyPlate, which was much more reasonable than the food pyramid. Of course, it was heavily criticized by conservatives because they claimed it was a “nanny state”.
But of course, like everyone in Trump’s circle, RFK Jr. rebrands someone else’s work, pretends he is the first person to ever suggest eating healthy, and then every stupid Trump voter with the apparent memory retention of a goldfish acts like he was the first person to ever suggest eating healthy.