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care teamYou used this phrase, and I like it.
I see this as the core of the problem, and I might just be re-phrasing what you are saying.
I risk veering off into politics here, and I don't really want to, but I do think that the profit-centered healthcare system in the United States creates this separation of people who should really be consolidated into a single team. There should be a team of people working together: Dieticians, physicians, etc.
But, in my experience, everything is siloed pretty bad. Physicians work for one company, the dieticians work for another. Everybody is divorced from one-another. Nobody is part of a consolidated team.
Ideally, you would have both a PCP, and a dietician that you could consult, both of whom are part of a team, share the same medical records system, talk to each other over lunch, etc.
Let the doctors do the doctor part. Let the dieticians do the dietician part. Let them both work together for the benefit of the patient. But, integrate them into the same system.