Dietary diversity, is a long standing public health recommendation. Yet, remarkably,  For example, it is unknown whether dietary diversity reduces intakes of unhealthy food components such as refined grains, processed meat, salt, or trans-fat, e.t.c. In addition, most , but not all evidence to date link dietary diversity and quality to weight gain and metabolic disorders including type II diabetes (T2D) incidence and mortality.We have home works on how to operationalize dietary diversity locally and universally.