The catch is, they have to eat it within an eight hour time period. Fittingly, it's called the Eight Hour Diet.
While it does say people can eat whatever they want, it recommends super foods like fruits, vegetables and nuts.
The authors say America's 'round the clock snacking is partially to blame for obesity problems. Their book says by not eating for 16 hours a day, your body draws energy from fat storage, helping you lose weight.
We asked a local dietitian, Ashley Simper to weigh in on the idea.
"I would not encourage something like that ever, long term. It's more healthy to do it in terms of eating the three meals or three meals and two snacks across the span of the day at times that work for you," Simper said.
Simper said the diet could be healthy if people chose to eat healthy foods during that time period. She said some people might take it as an eight hour free-for-all, and eat more calories than they normally would.