To me, the mood system seems a little redundant. I mean, really it's just a different kind of energy meter, but pretty similar. A lot of the same things boost or drop it, and it doesn't have as many noticeable side-effects.
And the balancing of it is off too: mood was an issue for me in the beginning, when I couldn't make my own drinks, and so I was constantly losing mood. I stopped making stinky cheese and got me a blender, and mood became a non-issue, as long as I made sure to have some fruit handy for blending. After acquiring higher-level animal and plant interaction skills, I don't even bother making drinks; my animal and plant interactions, for food and quests, produce mood as a by-product. My mood hasn't dropped below "pretty happy face" in a long time, and I haven't even paid attention to it.
The tl;dr of it is that I think mood needs to be more distinguished from energy, and that it needs to be better-balanced over the course of the game.