Interestingly, the tulip craze was one of the early and more memorable things I've found stumbling the web. I believe some people were comparing it to the dot-com bubble.

So why not use other foods to compensate for the Vitamin D loss? A single serving of tuna naturally contains double(5 microgram) the amount of vitamin D present in a glass of fortified milk(2.5 microgram for fortified, 1microgram for non-fortified).

Why would I want to lower the quality of one food and replace it with another? I was on the organic milk bandwagon, but its simply inferior.