That's your indvidual professor, and that is a problem. She's doing several different things that ethical anthropologists should not do, including imposing her cultural values on other cultures. (And if it's really 'processed European foods' then she's seriously misrepsenting a complicated subset of cultural imperalism as expressed through food - which is a major, major problem, both historically and contemparily, and "access to processed food makes you fat" is about the most facile summation of it I can think of.)

You might want to write a note to the dean about it, if you feel comfortable doing that. I'd avoid focusing on the band society thing - I don't doubt you that she's doing it, but it can be really hard to cite examples of inappropriate romanticism convincingly, especially since the band structure is attractive, so the creepy might be hard to convey. But the inappropriate moralizing is something that should be readily documentable.