The emphasis on sAttvIka AhAra actually is a vehicle for upward mobility and weakening of caste in contrast to a set up where caste barriers are insurmountable through personal behavior
Contrast this with a world where barriers across communities are iron clad with no scope for upward mobility by changing habits
I can marry the person I am dating from a different caste. Because she shares my habits and is also vegetarian / teetotaller etc..
So by making the behavioral standard supreme you are weakening the ethnic criteria for marriage
But its a start to engineer piecemeal social change.
Because the behavioral standard then trumps your lineage.
It makes both liberals and Trads uncomfortable. And I like it