"These were huge differences for a 5-week study," Peterson said. "I was very surprised by that."
To do the study, Peterson and her colleagues had eight men who showed early signs of diabetes restrict their eating window to just six hours. During this time, they ate only food provided by the researchers, and only while under supervision. Importantly, in order for the researchers to home in on the potential benefits of fasting that were not linked with weight loss, the study participants were not supposed to lose any weight. With that in mind, they were given just enough food to maintain their current weight. .