Does a wrong diet make you more violent?

This is really curious news that I don’t read the first time, but on which they have conducted more than one study (of an observational type, therefore we cannot say that there is a causal link): a wrong diet would be related to a more violent and criminal . A bit of a Lombrosian thing, if you like, but the studies linking a diet lacking some nutrients to aggressive behavior are starting to be numerous.

Here are some of them:
– A 2006 British study on Aylesbury Prison, showed how giving a multivitamin to prisoners in their daily diet would reduce violent behavior and fights in prison by 37%.
– According to the National Institute of Health, people with a history of violence if they take omega-3 fatty acids reduce problems related to anger and aggression by a third . The fault would be a diet rich in prepared and industrial foods often too rich in Omega6.

– The same institute has mapped the cases of violent crimes correlating them to geographic areas with the highest consumption of omega6 since the 1960s, and finding a correlation (which we recall, however, is not a causal link).
– Oxford University conducted a study on a sample of over two hundred males with violent and criminal behaviors : noting that, with a supplement of vitamins and omega-3 fatty acids of at least five months, the behaviors were reduced by 35 percent compared to the group that had taken a placebo ( source ).

Finally, a survey conducted on French hamsters : it seems that the deficiency of B vitamins, in particular niacin, due to the diet of parks and zoos rich in corn and cereal mash (in turn rich in omega6) has it drove the hamsters crazy , who behaved so aggressively that they bite and eat each other ( source ).
Furthermore, there are studies that have linked a deficiency in some vitamins to psychological problems, for example vitamin D with SAD and depression in general.
In short: it is good to remember that the unhealthy and poorly nutritious diet cannot cause to justify violent behavior. That the deficiencies of vitamins, mineral salts and omega3 fatty acids may be linked to cognitive and behavioral problems is however a field of investigation that, in my opinion, makes sense to continue to investigate.