The upshot of this study is that heterosis is the reason multiracial people are perceived as more attractive. There is debate, however, over whether Heterozygotes are healthier or whether it is all an illusion. It has been shown heterozygotes are indeed more resistant to infectious diseases such as HIV. Other researchers, however, have failed to find a correlation between attractiveness and actual health, although this may be a result of advances in medicine in helping the less heterozygous overcome genetic susceptibility to illness.