Kristin Newby, M.D. American Heart Association chair of the oversight advisory committee for the Go Red For women strategically focused research network and professor of medicine and cardiology at Duke University.
copyright American Heart Association 

"Why is timing turning out to be something associated with heart health? And I think that's the question the study really can't answer. And we could postulate a number of things. Is it because people who eat later eat different types of food than people who eat earlier? Does the timing of when they're consuming their calories reflect other behavioral risk factors that aren't really measured in this study? So how much they exercise, how much they sleep, other things that we just can't tease out yet."