Burning up for spicy food? Here’s the science behind it

Jody Denton, a self-described “chili head,” ran an experiment with his two young daughters, Ana and Olivia. As they grew up, he cooked their meals just a little bit spicier than they wanted. They’d complain. He’d apologize. But the very next meal, he’d bring the heat. Years later, his daughter Olivia — now 19 — came home from college for the summer. Sitting at the dinner table with her dad, …