abstinent or abstemious?

The dictionary definitions will clear your doubt:
http://oxforddictionaries.com/definition/abstinent?q=abstinent
http://oxforddictionaries.com/definition/abstemious?q=abstemious

I was under the impression that both derive from 'abstain'.

Hi,

http://www.etymonline.com/index.php?allowed_in_frame=0&search=abstemious&searchmode=none

Clive

Abstinent comes from 'abstain', from the Latin ab(s)- (away from) tenere (holding(onto), compare 'tenet')

Abstemious comes from the Latin ab(s)- (away from) temetum (strong drink).

You can probably use either at this remove, but might want to prefer Abstemious in matters of food and drink.

Source: etymonline.com