Cardiologist Ethan J. Weiss, MD, followed an intermittent fasting diet for 7 years. He lost about 3.6 kg (8 lb) and began recommending the approach to friends and patients who wanted to lose weight.
“I liked the way the diet was so simple,” said Weiss, an associate professor at the Cardiovascular Research Institute, University of California, San Francisco (UCSF).
But he also felt “it was too good to be true because you can eat what you want as long as it’s within a narrow window.”
So when, last year, he conducted a randomized controlled trial, TREAT, testing such an approach — eating during just 8 hours a day, fasting for the remaining 16 hours — versus an eating plan of three meals a day without restrictions, he was somewhat dismayed to find the group of people who fasted didn’t lose any more weight than the other group.