@MehGuy
it does shape your mood. Caffeine is a stimulant and sugar are stimulants and can help you focus. the same way adhd medications work.
It's funny ya'll are talking about this because I just made a comment to a friend that I was running out to get a coffee. Not because of the caffeine, but because of the sugar. Sugar helps me to focus. Caffeine has no effect.
While in the drive-through, I did a quick google search to see if it was just me, and apparently there are scientific studies that say sugars (which break down to the sugar glucose) do have positive effects on your ability to focus and so forth.
I don't know. Certainly matches my experience.