Okay, just double checked and I don't think you can digest NPCs but I could have programmed it to generically do so. There is a form of weight gain (albeit slow and not very visually represented well). And there is a digestion system in play (which is super slow), which I think you can use the "digest" command, which acts like "wait" but focuses on digesting things in your stomach. I think I need to make a better document for this game😅