Quantifying Drosophila Feeding Behavior Using flyPAD and optoPAD

Quantifying feeding behavior with high temporal and spatial precision is critical for understanding how internal state, sensory cues, and neural activity shape food intake and dietary choice. Here, we describe a detailed protocol for performing consumption and dietary choice assays in Drosophila using the flyPAD/optoPAD system. This method enables simultaneous measurement of feeding events across multiple arenas while allowing precise control of gustatory stimuli and optogenetic stimulation. We provide step-by-step instructions for assay food preparation, flyPAD arena setup, data acquisition, and downstream data organization with suggested analyses. This approach is suitable for studying consumption, nutrient preference, learning, and state-dependent modulation of feeding behaviors, and can be readily adapted for optogenetic manipulations and comparative choice assays.

High throughput, quantitative measurement of Drosophila feeding behavior. Easy integration of optogenetic stimulation for precise control of neural circuits.Compatible with both open-loop and closed-loop optogenetic stimulation paradigms.Versatile applications for consumption, nutrient preference, learning, and state-dependent feeding behaviors.Step-by-step guidance from arena acquisition and calibration through statistical modeling.