On his blog Harold McGee, food scientist extraordinaire, explains why some of the most important staples of any reasonable household should be kept under wraps. Olive oil, milk, butter, and beer should all be stored in dark places, and for similar reasons.
You’ll have to read for yourself to understand the science behind skunky beer. Of course, as soon as he gets into compounds and lightwaves, our poor little brain starts to ache. The interesting news here is that when these foods take on an off-flavor, it’s a sign that nutritional losses are taking place. Funky milk lacking calcium? No and no!