It seems that weight is sort of covered under Stamina, I would think... Sure, an actual weight isn't specified, but weight is variable from day to day (you even weigh more at night than when you woke up in the morning!), so what are we going to do, have a player's weight change very day based on what he ate and how much walking he did?
Don't ask what sort of Chunks they are, you probably don't want to know. Blowing Chunks since Season 4!