A model of executive leader health was proposed to investigate the extent to which executives’ lifestyle behaviors related to their risk for metabolic syndrome (MetS, i.e., "The Silent Killer") and in turn, the extent to which the risk for MetS related to perceptions of leader energy and effectiveness. A sample of 380 executive leaders that attended a week-long leadership development seminar was used to examine: 1) the relationship between leaders’ lifestyle behaviors and their physical health (i.e., risk for MetS) and; 2) the relationship between leaders’ physical health and perceptions of their energy and effectiveness on-the-job. Data were collected from multiple sources, including self-report, objective health measures, and ratings from the leaders’ subordinates and bosses. Findings demonstrated that lifestyle behaviors of executive leaders, including exercise habits and diet, related significantly with risk for MetS. Risk for MetS was also significantly related to perceptions of leaders’ effectiveness, as rated by their bosses and subordinates. Further, leaders’ energy levels, as rated by their subordinates mediated the relationship between risk for MetS and leader effectiveness. Exercise and diet appear to play an important role in the health and energy of executive leaders, which in turn relates significantly with their effectiveness on-the-job.