The caffeine hypothesis may be contradicted by the experiences reported here: http://www.nytimes.com/2009/03/26/health/nutrition/26best.html http://www.nytimes.

The caffeine hypothesis may be contradicted by the experiences reported here: http://www.nytimes.com/2009/03/26/health/nutrition/26best.html http://www.nytimes.com/2009/03/26/health/nutrition/26best.ht... I'm disappointed that the BBC article doesn't specify how to find Dr. Elisaf's study; I suspect he's far more detailed. The work appears only to warn that muscle weakness is more likely with large amounts of "cola" -- I presume Dr. Elisaf give some quantification of "large". They're suspicious of fructose, sucrose, and caffeine; a commentator here has already identified a fourth possible culprit. It could be specific amounts of any of those, of other ingredients (perhaps least likely, the Kola nut? http://en.wikipedia.org/wiki/Kola_nut http://en.wikipedia.org/wiki/Kola_nut), or of some combination of them. "Further research needed" is the only practical message I get from the BBC article.