"what you actually do doesn't always reflect what you really prefer."

It is possible for the body to be broken so that it doesn't reflect the will. But if the body is whole, its actions reflect the genuine will of the entity - to the degree that it can, of course.

If my neck is broken and my spinal cord severed, I can't say that I don't prefer to eat because I don't pick up the apple sitting on the table. I'm paralyzed. My movements (or lack thereof) are no longer connected to my will.

With me just sitting here, though, the fact that I have not picked up the apple means that I do not prefer to pick up the apple.