It was simply an expansion of that particular gene variant, but yes, I would assume there is a correlation between coffee intake and impulsive crime in some gen

It was simply an expansion of that particular gene variant, but yes, I would assume there is a correlation between coffee intake and impulsive crime in some genetically predisposed subpopulations, but I cannot say whether it is linear, nonlinear or perhaps inverse. What I can definitely tell you is that there is a positive correlation between heavy coffee intake (>= 8 cups per day) and suicidality. I assume that is the result of the anxiogenic and impulsivity-increasing actions of particular Harmala alkaloids, namely harman and norharman. https://link.springer.com/article/10.1023/A:1007614714579 https://link.springer.com/article/10.1023/A:1007614714579