Where fat, salt and sugar meet is a place that makes our toes curl in pleasure. But once you’re hooked, is there any going back? Remember your very first trip to a fast-food joint? I do. With near-frightening clarity. I was 8 years old. One day while out shopping, my mom took me to a magical, American restaurant with some very golden arches on their signage. There, she ordered me a cheeseburger and fries.