Cochrane (http://www.cochrane.org/ http://www.cochrane.org/) is often a good aggregator for medicine-related subjects. Unfortunately, it doesn't look like they'

Cochrane (http://www.cochrane.org/ http://www.cochrane.org/) is often a good aggregator for medicine-related subjects. Unfortunately, it doesn't look like they've got anything good for this one -- just a few things relating to caffeine and pain, pregnancy, etc.: http://uk.cochrane.org/news/caffeine-and-health-evidence-cochrane http://uk.cochrane.org/news/caffeine-and-health-evidence-coc...