What makes molten chocolate so much more filling? I love chocolate. (I'm sure I'm not the only one). Today I made some cookies, which I dipped in molten chocolate (basically dark chocolate + a bit of butter, molten au-bain-marie) and I had a bit left over. Since it'd be a waste of chocolate to throw it out, I decided to eat it with a bit of banana for desert.

Basically I had three slices of banana with warm, molten chocolate, and then I felt pretty stuffed. Which is weird; as I would normally have little problem eating a whole bar of chocolate for dessert (which should be about 10x as much chocolate, if not more). And this isn't the first time I had some left-over molten chocolate and immediately felt stuffed from it.

Is there something about the melting of chocolate that makes it come down so much harder than ordinary chocolate? Or is this just in my head?
Having done something very similar the other day, I think the banana  accounts for more than you think (you don't say how big your slices were, but 3 big slices could easily add up to the whole very small banana I coated in chocolate left over from dipping  these biscotti).  The butter will make a tiny bit of difference unless you used loads.  I don't add any when dipping, and chocolate is mostly fat anyway. Fibre in the banana is filling, and fat from the chocolate is satisfying, so the combination makes you really feel like you've eaten.  

Another factor is that dipping cookies uses up surprisingly little chocolate, and chocolate looks like less when liquid so you may well have had more chocolate than you thought.  By the time you dipped the banana it might have thickened a little so you could scoop a nice thick layer.

You didn't by any chance have a few mishapen/broken cookies in the batch that needed "testing", did you?