“…The research area was distributed among the United States [13,14,33,34,37], United Kingdom [12], Israel [32], Singapore [35], China [38,42] and Canada [14]. Four studies assessed both types of DM [13,35,37,38], the remaining six studies only assessed type 2 DM [12,14,[32][33][34]36,42]. Studies provided data on executive function [12,14,[32][33][34]36,37], complex attention [14,32,34,36,42], language [32,34,37], memory [12,14,32,34,36,37,42] and overall cognition [13,32,[34][35][36]…”