This course delves into the complex brain mechanisms influencing why we eat beyond simple hunger or diet rules, framed through the interdisciplinary field of Nutritional Psychology. It begins by exploring the Dual-System Model, which contrasts homeostatic eating (for energy balance) with hedonic eating (for pleasure), and how these sometimes conflicting drives interact with internal signals, emotions, and environmental cues. Moving beyond this binary view, the course incorporates higher cognitive functions such as memory and impulse control, illustrating how these mental processes intertwine with biological systems to shape eating behaviors.