Millennials are a major part of the massive growth of fast casual, and their preferences are helping to create the “Chipotlification” of fast food as the rest of the industry attempts to innovate to keep up. “Customization seems to be the quickest shortcut to stealing some of Chipotle's thunder,” and Taco Bell’s new mobile-ordering app is a clear indication of this trend: it allows customers to choose any toppings and create previously impossible menu combinations. McDonald’s is also experimenting with two new, more personalized choices. (The Atlantic)