carrot-cruncher
n.— «Carrot-munchers 1; global confectionery giant 0. For millions of people around the world, Sunday’s climbdown by the makers of Mars Bars was a particularly sweet success. I use the term “carrot-munchers” affectionately, being one myself. Indeed, in the six years since I joined the ranks of the veggie brigade, I’ve lost count of the number of times it’s been sneeringly suggested that carrots are all I eat.» —“How the carrot-munchers won at crunch time” by Eleanor Cowie The Herald (Glasgow, Scotland) May 22, 2007. (source: Double-Tongued Dictionary)