“The only sustainable foundation for a changed world is internal transformation” — that’s the message of Sonya Renee Taylor, author of “The Body Is Not an Apology.” Her mission is to take us out of the realm of mere “body positivity” or “self-acceptance” and into a place of “radical self-love.” That means not just creating a world where all bodies are celebrated, but also embracing who we are, exactly as we are. Which part of that mission sounds harder to you?