APOE and infection: Consistent with the notion that meat eating (i.e., increased dietary fats) improves adaptive responses to pathogens and facilitates reproduction in populations where infections are highly prevalent, it is noted that fertility and fecundity were found to be higher in APOE ε4 allele carriers in the indigenous populations of South America (Corbo et al., 2004), West Africa (van Exel et al., 2017), and rural individuals of Western Europe (Jasienska et al., 2015).