There's a place in Austin where it's not just a donut burger, but a donut is served with any entree. https://static.spacecrafted.com/d2d167f24f6d4582b7828211d5661e2e/r/da5699601e094ebe9c517e7c52ffa66f/1/Entrees&Sandwiches.pdf  You can't tell me that the business doesn't owe it's existence to fats, even in a generally health-focused place like Austin. When I had to go to the city for training, all my coworkers just wanted to rave about it.