Inspired by this article from BBC Science:
Bitter we get from various alkaloid/alkaline(??) things. Sour from acidic ones. Sweet from sugar - and things that imitate sugar. Salty just from salt? (and salt substitutes?)
So does the MSG taste just come from MSG? Does MSG occur naturally in some plant or meat foods, if so, what? And what exactly does it taste of, because I thought it was just a flavour enhancer to open up your tastebuds to help you taste other things more?