Zach Galifianakis: The Makeover 3

Zach Galifianakis' dramatic weight loss has gone next level ... even the guy's beard is thinning down!

The funnyman looked like a fraction of his Carlos-toting 'Hangover' character on his way into lunch Wednesday in Venice.

Zach's said he dropped the lbs through healthy eating and less boozing. Whatever he's doing looks wayyy better than any of the 'Hangover' sequels.

Especially #3.