This is called "Nutritional epidemiology"[1] and there are quite a few really big studies already done about this[2][3] Technology and big data would make them

This is called "Nutritional epidemiology"[1] and there are quite a few really big studies already done about this[2][3] Technology and big data would make them easier to do, but not sure whether you were thinking along this line or not. [1] http://ije.oxfordjournals.org/content/32/4/486.full http://ije.oxfordjournals.org/content/32/4/486.full [2] http://en.wikipedia.org/wiki/The_China_Study http://en.wikipedia.org/wiki/The_China_Study [3] http://en.wikipedia.org/wiki/Nurses'_Health_Study http://en.wikipedia.org/wiki/Nurses'_Health_Study