Quantifying Drosophila Feeding Behavior Using flyPAD and optoPAD

Abstract

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. HighlightsO_LIHigh throughput, quantitative measurement of Drosophila feeding behavior. C_LIO_LIEasy integration of optogenetic stimulation for precise control of neural circuits. C_LIO_LICompatible with both open-loop and closed-loop optogenetic stimulation paradigms. C_LIO_LIVersatile applications for consumption, nutrient preference, learning, and state-dependent feeding behaviors. C_LIO_LIStep-by-step guidance from arena acquisition and calibration through statistical modeling. C_LI