Optimal diet selection, a component of optimal foraging theory, suggests that animals should select a diet that either maximizes energy or nutrient consumption per unit time or minimizes the foraging time needed to attain required energy or nutrients. In this exercise, students simulate the behavior of foragers that either show no foraging preference or demonstrate a foraging preference based on profitability ratios (average energy content of food item, E/average handling time, h). Foragers that optimize their diets consistently acquire more total energy in a timed foraging period. The demonstration is scalable to a full laboratory exercise with statistical analysis and graphing activities.