1) Abstemious 2) Abstentious 3) French word used in English 4) Like a teetotaler 5) Self-restraining 6) Showing self-restraint 
• (a.) Refraining from indulgence, especially from the indulgence of appetite; abstemious; continent; temperate. • (n.) One who abstains. • (n.) One of a sect who appeared in France and Spain in the 3d century.
Ab'sti·nent adjective [ French abstinent , Latin abstinens , present participle of abstinere . See Abstain .] Refraining from indulgence, especially from the indulgence of appetite; abstemious; continent; temperate. Beau. & Fl. 
[adj] - self-restraining
abstentious adjective self-restraining; not indulging an appetite especially for food or drink; `not totally abstinent but abstemious`