> Despite not being required to cut calories, participants were eating an average of 500 calories less, and what they were eating was high quality. This could

> Despite not being required to cut calories, participants were eating an average of 500 calories less, and what they were eating was high quality. This could also be simply attributed to being watched. That to me is a huge confounding factor that needs to be carefully isolated in all diet studies. The huge success of personal fitness trackers suggests people tend to have healthier lifestyles when they measure their actions, even if it's for their own personal record (let alone for sharing on social media or being studied).