To be inconsistent

I think of myself as a rational, logic, intelligent being.

However I, very often, do inconsistent stuff. Why is that?
For instance, I care for the environment, but I throw all my trash in the same bag, and then sneak it out of the house... I also drive a car thats not at all environment friendly...
And I want to live more healthy, started going to the gym and try to eat better. But now and again I just stuff my face with chocolates or cheese... And I find all sorts of excuses not to go to the gym.

Inconsistency is probably a large part of being human.
I´m working on becoming more robotic, but I´m not to consistent in that either ;)