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Did you read the paper? I did. There is no way that any study can make adjustments for family factors. And even if there seems to be a correlation, that does not prove that drinking the soda caused more aggression.

No you didn't, nor have I - the paper hasn't been published yet. Sampling protocols will be addressed and the statistics defined and explained. Rather than immediately attacking the validity of a study that disagrees with what you believe/seems reasonable/your momma told you/you dreamed, think about what was claimed. You actually stumbled into some insight when you said, "if there seems to be a correlation, that does not prove that drinking the soda caused more aggression". In the provided article, the researchers never claimed that "drinking pop causes aggression", they said that there was indeed a correlation between kids that drink a lot of pop and aggression. As I mentioned earlier, I think the dynamic that allows for a kid to drink a lot of pop is the same one that account for aggression - it is not a post hoc ergo propter hoc argument.