If you had read all: > This [..] study [..] focused on people of East Asian descent, many of whom have genetic variants that limit alcohol tolerance. > Because

If you had read all: > This [..] study [..] focused on people of East Asian descent, many of whom have genetic variants that limit alcohol tolerance. > Because the variants have specific and large effects on alcohol, but do not effect other lifestyle factors such as diet, smoking, economic status or education, they can be used by scientists to nail down causal effects of alcohol intake and > The research team - including scientists from Oxford and Peking universities and the Chinese Academy of Medical Sciences, said it would be impossible to do a study of this kind in Western populations, since almost no-one there has the relevant alcohol-intolerance gene variants. it's the base pillar of their study..