However, one problem has been that some of the research has struggled to identify whether the findings were related to the fact that mothers from more affluent backgrounds were more likely to breastfeed and it was factors related to the family circumstances that was really influencing intelligence.

BBC: Breastfeeding 'helps to boost IQ'

The numbers could be even worse as statisticians said they chose a more conservative approach to estimating diet and lifestyle-related deaths, saying the factors might actually cause 500, 000 deaths annually, as much as cancer.

FORBES: Smart Money Still In Fat

Let's start with two related questions: If early biological and genetic factors beyond the individual's control make some people more likely to become violent offenders than others, are these individuals fully blameworthy?

WSJ: Neurocriminology: Inside the Criminal Mind