The food pyramid was around long before the Reagan Administration. I remember it from grade school, so I probably saw it in the late 60s thru mid 70s.
I stand corrected. I was in grade school in the 80s and remember it being bandied about as the de facto health standard.
It was well-entrenched by the time Ronnie took office. There’s no way he could have gotten rid of it in 8 years even with a full-court press - which he didn’t have the scientific backup to attempt.