I don't know the exact science of it, but for me (and my friend who turned me on to Primal) this has happened. I used to be able to drink/eat sweet things by the gallon but now even a sip of sweet stuff is really too much for me. Sweet and me do not mix nearly as often as before.
Also, I've developed a taste for green tea; everyone else says it tastes bitter but it tastes fine to me. My friend also had a similar experience so I *think* it's normal.