Patron of a farm-to-table restaurant, maybe

• Farmers' market frequenter, maybe
• Typical farmers' market patron
• Farm-to-table advocate
• Farm-to-table consumer
• One inclined to patronize a farmer's market

Wiktionary Word definitions in Wiktionary
n. One who tries to eat only locally grown foods.

Douglas Harper's Etymology Dictionary Word definitions in Douglas Harper's Etymology Dictionary
one who eats only locally grown or raised food, by 2001, from local + ending abstracted from carnivore , etc., ultimately from Latin vorare "to devour" (see voracity ).