Before “sustainable” was a term bloated with social cachet and venture-capitalist funding, there was a little health food store that began that branch of the food business in 1973. North of L.A. in Canoga Park, Follow Your Heart sold avocado sandwiches for 95 pennies. It would go ahead to become worldwide natural-foods brand, rounding up $50 million in deals a year ago. Along the way, business owners Bob Goldberg and Paul Lewin — hippies in the ’70s, in the same way as other organizers of the movement — would help shape how Americans eat. Their impact is significant: Thanks to them and their countrymen, natural spinach became normal. Whole wheat bread isn’t an uncommon thing anymore.