Food trends seem to go in cycles. Right now, the popular diet that is sweeping the West is Paleo.
The modern Paleo movement is a recent dietary trend, and it is diametrically opposed to many food movements that came before it.
For example, in the hippie era of the late 1960s, Macrobiotics came on the diet scene. Its focus was on eating lots and lots of whole grains. In fact, the Macrobiotic diet could go as far as 90% of food being whole grains (not recommended, by the way).