After dinner, mitchell feels full and satisfied. a few minutes later, he gets up off the couch, heads to the kitchen, and grabs a candy bar. his anticipation of the delicious taste of chocolate is his for choosing to eat even though he is full.

Incentive

Explanation:

Mitchell feels full after having food and is not willing to eat but his anticipation to eat chocolates is his incentive as he is full.

The incentive is a force of motivation which motivates the person to achieve the goal of interest. Even if the tasks is complete the person will do more work in order to get incentive.

Here, the chocolate bar is acting as an incentive in which the person is willing to eat chocolates even if he is full.

avoiding recreational drugs instead of using them