Jack has started a new diet program. He wants to lose thirty pounds. His wife is supporting him and he feels that the weight loss is under his control. His change in behavior reflects the theory of

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Jack's change in behavior suggests that he has made a conscious decision to lose weight and he believes that he has control over achieving his goal. These are key principles of the theory of planned behavior, which suggests that behavior change is driven by three factors: attitudes, subjective norms, and perceived behavioral control. In this case, Jack's attitude towards weight loss is likely positive, as he has made the decision to start a new diet program. He also seems to have the support of his wife, which can influence his subjective norms around weight loss. Finally, his belief that he can control his weight loss (perceived behavioral control) is a key factor in the theory of planned behavior.

Jack Has Started a New Diet Program