Wine is an alcoholic drink made from a fermenting fruit, as opposed to starches used in beer. Wine is found in both Deus Ex and Deus Ex: Invisible War. Consuming Wine gives the player 2 health points and applies an obstructing "Drunk" effect to the player's HUD.
However, in Deus Ex: Invisible War, drinking alcohol of any kind will interfere with your nanosystems. It will produce a green filter on the screen (IW's "drunk" effect) and cause a poison effect that slowly reduces health until the player is dead or the effects wear off, usually the latter.