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Kevin comments on Open Thread: May 2010 - Less Wrong
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"Effects of nutritional supplements on aggression, rule-breaking, and psychopathology among young adult prisoners"
Likely the effects were due to the fish oil. This study was replicating similar results seen in a UK youth prison.
http://www3.interscience.wiley.com/journal/123213582/abstract?CRETRY=1&SRETRY=0
Also see this other study of the use of fish oil to present the onset of schizophrenia in a population of youth that had had one psychotic episode or similar reason to seek treatment. The p-values they got are ridiculous -- fish oil appears to be way more effective in reality than I would have expected.
http://archpsyc.ama-assn.org/cgi/content/short/67/2/146
Take your fish oil, people.
What about snake oil?
I don't know if your kidding or scoffing, but I will give a straight answer.
Richard Kunin, M.D., once analyzed snake oil and found that it is 20 or 25% omega-3 fatty acids.
The link is giving me trouble. Can you paste the whole abstract?
Effects of nutritional supplements on aggression, rule-breaking, and psychopathology among young adult prisoners
ABSTRACT Objective: In an earlier study, improvement of dietary status with food supplements led to a reduction in antisocial behavior among prisoners. Based on these earlier findings, a study of the effects of food supplements on aggression, rule-breaking, and psychopathology was conducted among young Dutch prisoners.
Methods: Two hundred and twenty-one young adult prisoners (mean age=21.0, range 18-25 years) received nutritional supplements containing vitamins, minerals, and essential fatty acids or placebos, over a period of 1-3 months.
Results: As in the earlier (British) study, reported incidents were significantly reduced (P=.017, one-tailed) in the active condition (n=115), as compared with placebo (n=106). Other assessments, however, revealed no significant reductions in aggressiveness or psychiatric symptoms. Conclusion: As the incidents reported concerned aggressive and rule-breaking behavior as observed by the prison staff, the results are considered to be promising. However, as no significant improvements were found in a number of other (self-reported) outcome measures, the results should be interpreted with caution. Aggr. Behav. 36:117-126, 2010. © 2009 Wiley-Liss, Inc.