according to science was specifically regarding serving sizes. that's what the article is about. it's drawing its motivation from official US government health

according to science was specifically regarding serving sizes. that's what the article is about. it's drawing its motivation from official US government health institutions which I would assume (hope) are run by scientists at least with regard to those recommendations. no source is regarding the you should feel hungry. but then again this follows from this article as a corollary.