Questions of Fact

As Eliza Barclay reports, since people tend to underestimate how much they eat and overestimate how much they exercise, these self-reported measures “no longer have a justifiable place in scientific research,” says a new paper published in the International Journal of Obesity:

“That’s some strong language, considering that these data have been used in hundreds of major studies to inform hundreds of public health policies and clinical recommendations.

“The underlying message here? A lot of these policies and recommendations are wrong and misleading people in their decisions about their health.”