Dr. Lustig is a nationally-recognized authority in the field of neuroendocrinology, with a specific emphasis on the regulation of energy balance by the central nervous system. He is currently investigating the contribution of biochemical, neural, hormonal, and genetic influences in the expression of the current obesity epidemic both in children and adults. He has defined a syndrome of vagally-mediated beta-cell hyperactivity which leads to insulin hypersecretion and obesity, and which is treatable by insulin suppression. This phenomenon may occur in up to 20% of the obese population. He is interested in the hypothalamic signal transduction of insulin and leptin, and how these two systems interact. He is studying the cardiovascular morbidity associated with hyperinsulinemia, and developing methods to evaluate and prevent this phenomenon in children. He is also analyzing the contribution of the autonomic nervous system to insulin secretion and insulin resistance in obese children, and the utility of assessing insulin dynamics in targeting obesity therapy.