Although Cognitive Behaviour Therapy (CBT) has successfully combined procedures based on behavioural and cognitive theories to reduce emotional problems, there is limited research into the efficacy of CBT in changing health behaviours. Of the studies cited by Hobbis and Sutton (this issue), only one measured health behaviours. In order to evaluate the effectiveness of behaviour change techniques, it is essential that the endpoints are behaviours, rather than health or emotional outcomes. There are both theoretical and circumstantial reasons for believing that CBT may be effective for changing health behaviours. Hobbis and Sutton have considered CBT as an addition to the Theory of Planned Behaviour-based interventions. It may be even more effective as an alternative.