For anyone who is interested in the World Health Org's stance and a little more of the science behind Oral Rehydration Solution:
http://www.who.int/child-adolescent-..._CAH_01.22.htm
ETA: This CDC/American Academy of Pediatrics article has a table which compares osmolarity of common soft drinks compared with rehyd fluids:
http://www.cdc.gov/mmwr/PDF/RR/RR5216.pdf
And then this table I found on another web site
http://www.medicdirectsport.com/spor...?step=4&pid=91



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