Yea, Bryce didn't do this for health. He did it because he wanted to look amazing in the magazine. Essentially, by denying the body sugar and water, you're preventing it from converting anything in to fat. This gives your body's muscles enhanced definition and that vein popping look.
(Image removed from quote.)
Best before and after cut pics I could find. Don't get me wrong, on the pic on the left's he's clearly got muscles. But the pic on the right shows exactly what denying food and water get you. More muscular definition. More veins popping. A more cut figure.
It's ironic, but when a body builder is competing on stage, he/she is at their weakest due to this cut.
In the example on the right the dude looks a lot smaller in overall size. Even though the camera angles/distance from camera are aprox. the same in both photos. Wow I didn't know that denying the body of water thing. Thanks for the visual example.