Three years ago, Jessica Hernandez was constantly thinking about food.

“I was so in my head about eating, I was going crazy,” says Hernandez, 50, of East Greenwich, Rhode Island. “I was saying, ‘I want to lose 3 pounds.’ And even though I was eating a low-fat diet, my weight seemed to be going up no matter what I did.”

After breakfast at 9 a.m., a snack at 10:30 a.m., lunch at noon, and a midafternoon snack, Hernandez ate dinner, then struggled over whether to have dessert. When she discovered Delay, Don’t Deny: Living an Intermittent Fasting Lifestyle by Gin Stephens, she was intrigued.