== "The truth about sports drinks" study == 

 A documentary on the BBC show Panorama, titled The Truth About Sports Products, covered how a group of researchers checked the claims made by sports drink companies 
 ...not finding any support for any significant importance of electrolytes in sports drinks, finding the sugar to be detrimental for most people (though good for top athletes) and sports drinks not being any less dangerous for water intoxication, to any notable degree. 

 The study itself can be found at the BMJ website, here: The truth about sports drinks 
 Also relevant is their press release, concerning the study and their related study How valid is the European Food Safety Authority’s assessment of sports drinks?