Edit : it should be noted that this is from 2003. I'm sure newer research has been done. (Re-Edit. Not much by the looks of it) One question this raises is why

Edit : it should be noted that this is from 2003. I'm sure newer research has been done. (Re-Edit. Not much by the looks of it) One question this raises is why isn't there a know correlation between high red meat diets and higher brain performance? All things being equal the the study suggests a significant advantage for higher intake. Here are my best guesses in order of likelyhood - The benefit is temporary and relates more to the raising of levels rather the absolute level. - The amounts of creatine involved (equivalent of 2 pounds red meat per day) are too much for anyone to ingest naturally for long, but this level is required to see significant benefits. - The benefits of creatine are being counteracted by some other substances in red meat therefore masking it's effect on heavy meat eaters. - The reported high average IQ of those who chose to become vegetarians masks the fact that the lack of creatine in their diet does actually make them dumber. Anyway it looks interesting especially for those without much natural creatine intake.