“Just about anything you need to stay healthy” can be had at these cross-borough natural food marts, which are “crammed” with “competitively priced” “vitamins and supplements”, “gluten-free” and organic items, “packaged goods” and other products “supermarkets don’t have”; juice bars and prepared foods also figure, but beware of “narrow aisles” that “can resemble a maze” and “not-so-nice...