An absolute line between doping and 'clever nutrition' will always be hard to draw but it can be discussed and a pretty sensible list agreed upon. There may be plenty of debate around substances that are of marginal benefit and whether these should be tested for, but at least those that provide athletes with clear advantages and/or pose health risks will quite reliably be put in the 'doping' bucket. EPO, steroids and HGH come to mind, I'm sure there are heaps more.
I haven't done any investigation but I'm sure WADA would have published some guidelines regarding what criteria should be used (or have been used by them, if they have made the call on behalf of the sporting codes) in determining a substance's status.
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