With music a recording isn't going to change no matter how many copys you make of it, but with food or drink the flavour of each item you produce can vary significantly. Take beer for example, the water from the area of each brewery can alter the flavour quite a bit, the Guinness you drink may taste different to the Guinness I drink and so on. Which particular flavour would be copyrighted, all of them? What if the water in an area changes over time, just how often would a flavour copyright need to be updated?