He says this kind of research could never replace modern medical studies.

VOA: special.2010.06.29

Now several lectures down the road we'll talk about modern food and epidemiology; that is what the research on food intake and human health, and what do we know about our health and well-being based on diets.

接下来的几堂课,我们将讨论现代食品和流行病学的关系,即食品摄入与人类健康方面的研究,我们通过饮食来了解自身健康状况

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选

Ruhli says such research could never replace modern clinical studies.

VOA: standard.2010.05.05