Both contain emulsifiers, which are added to improve texture and extend shelf life.
Bacteria in your gut tell your brain when you've had enough to eat.
I'm not suggesting that to be wiser, you should stop listening to your brain's wisdom. Instead, I suggest you broaden your attention beyond your brain to the rest of your body.
Extra and undigested food is processed through the intestines. Interestingly though, you don't seem to get rid of nearly half as much as you take in!
The connection between the gut microbiome and human health is currently being explored as part of the Human Microbiome Project. This project has inspired a new wave of research into the effects of the gut microbiome and is delivering interesting findings.