Remember when McDonald’s launched the McLean Deluxe in the early 90s to ride the wave of the low-fat diet era? The burger featured a 91% fat-free beef patty (the secret ingredient was a seaweed extract) and lasted a few years on the menu before it was yanked due to poor sales. It is now considered one of McDonald’s top five biggest menu flops. This example brings up an important question: What role, if any, restaurants should play in the latest fad diet or in the chase for the fickle health-conscious consumer in general? After all, restaurant visits have long been considered an indulgence a...