Icek Ajzen said that there are three factors to consider when predicting whether a person will engage in unhealthy behavior. It looked at a person's attitude towards the unhealthy act, as well as what is socially expected of them and control over their behavior. For example, if a person favors a behavior, the more likely they are to engage in that behavior, they will also be influenced by the opinions of others around them, in relation to that act. The final factor will be the perceived control of that person's behavior, i.e. whether they then control their own behavior or begin to submit to specific constraints.