Written by : SASHA ORMAN

EVERY YEAR NEW diet trends ebb and flow in popularity — and each one pulls an entire economy of products along with it . For evidence , look no further than the displays in your local bookstore .

“ Diet books are the key sales driver each year in the Health category and a strong-selling category within Cookbooks ,” says Edward Ash-Milby , buyer for Barnes & Noble . “ Many diet customers look for cookbooks to supplement their diet program so both subjects sell well , especially when a hot diet takes hold .”

But where some past trends have focused on only temporary diet shifts , many of today ’ s trends — juicing , the Paleo Diet , gluten avoidance — are about more of permanent lifestyle

8 March 2015