I'm going to reply assuming that this is a serious post and not a joke....I'd be SO happy if there were a low-fat, veg option in Gloucester!
In Downtown Gloucester Passports has some decent veg options, but I don't believe any would qualify as low-fat. Sugar Mag's serves lunch until 2 and they have a veg quesadilla and sandwich on the menu. There's also the Pleasant St Tea Co and they have sandwiches and salads, some are good veg options. Very casusal, order-at-counter place.
In Annisquam there is the Willow Rest a fabulous grocery/takeout place that has two very good veg sandwiches on the menu, cold drinks, snacks and great produce. Couple tables on-site too.
I'd say that if you're committed to low-fat, veg you're probably going to have to head to Beverly or Salem. I'd be pleased if someone has better suggestions. Happy Hikinh!
1 Holly St, Gloucester, MA 01930