John and Dave both eat the exact same 3 meals every day, for 30 days. When they both come home, they both do exactly the same workout. After the workout John has 50g of whey protein powder @ 110 calories, whilst Dave has 110 calories worth of coca cola (~290ml).

Now, given that protein helps muscle growth, and the more muscle you have, the more calories you burn, who loses the most fat after the 30 days?