When the narrative is controlled by big-pharma & big-food these professionals are called mis-influencers.
But,
ask any of the MILLIONS of people whose health has returned thanks to these people, and they will use different words.
What word would you use??
https://changingmarkets.org/report/meat-vs-eat-lancet-the-dynamics-of-an-industry-orchestrated-online-backlash/