People don't seem to get, The Deadly Sins aren't specifically about the worst things you can do, not everyone is going to be tested by the desire to murder, rape or commit treason, but in fact the Deadly Sins are something the everybody must be tested by.
Everyone has the temptation of lust. Everyone feels angry enough to be wrathful once in their life. And, as eating is a major part of everyone's existence, and traditionally of much greater spiritual importance, it just makes sense that one of the deadly sins is about it.
Same with Sloth. People don't think the sin associated with sleep and laziness is evil and badass enough, so they tweak it. But you spend a third of your life sleeping, it just makes sense that there would be Sins governing it's excess.