first of all, we shouldn't change our diet.
beware of food faddism n orthorexia.

few foods may be sold that will kill u immediately if eaten.
eating whatever u want n dying young is also a move.

smtg to do with evidence may be called epidemiology.
it's the nutritional version of that.

will organize my research on nutritional epidemiology someday.

food health is called such.
(are eggs bad? etc.)