I hadn't planned for panel two to be a fantasy panel, but I decided I wanted an interesting visual for my comic that happens to be a visual medium.
My intent with rounded borders in black (as opposed to grey) is that the visual isn't literal, but the dialogue is. I imagine this is obvious in context, but I also needed text to write in my commentary that happens to be a text medium.
As for how realistic Conan's situation is, it's not realistic to this extreme, but I'm fairly certain there are body types that have a relatively easier time putting on muscle, but also have an easier time becoming overweight.
Or I could be completely wrong about that and someone's about to yell at me. I don't know. I'm not a fitness scientist.
In any case, that's how it is for one side of Conan's family, and may I remind you that's talking to Grace, a human-squirrel-alien-alien hybrid. There might be scientific inaccuracy afoot.