Last year, Zach joked about his weight loss, telling Conan O'Brien, "I've had a lot of plastic surgery… A lot of work on my torso and face. I started not eating.” Watch!
A few years ago, Galifianakis revealed that his decision to cut out alcohol also helped him lose weight. He told Conan, “I stopped drinking and I just kind of put the weight off. I was having a lot of vodka with sausage… delicious but bad for you.”