These are my slides from the European Health Psychology Society 2013 Conference Roundtable: Provocations for future directions in health psychology, convened by Kerry Chamberlain and myself. My proposition was that health psychologists are risking to become behavioral engineers with participants as objects on whom behavior change techniques are tried on to find most effective ways to achieve intervention objectives drawn from health guidelines. Other provocateurs were James C. Coyne, Britta Renner, Marie Santiago-Delefosse, and Charles Abraham.