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Abstract Background Aromas have been associated with physiological, psychological affective and behavioral effects. We tested whether effects of low-level exposure to two ambient food-related aromas (citrus and vanilla) could be measured with small numbers of subjects, low-cost physiological sensors and semi-real life settings. Tests included physiological (heart rate, physical activity and response times), psychological (emotions and mood) and behavioral (food choice) measures in a semi-real life environment for 22 participants. Results Exposure to ambient citrus aroma increased physical activity (<it>P</it> <0.05), shortened response times in young participants (<it>P</it> <0.05), decreased negative emotions (<it>P</it> <0.05), and affected food choice (<it>P</it> <0.05). Exposure to ambient vanilla aroma increased projected introvert emotions (<it>P</it> <0.05). All effects were small relative to estimated effect sizes. Conclusions The test battery used in this study demonstrated aroma-specific physiological, psychological and behavioral effects of aromas with similar appeal and intensities, and similar food-related origins. These effects could be measured in (semi-) real life environments for freely moving subjects using relatively inexpensive commercially available physiological sensors.</p

Differential effects of exposure to ambient vanilla and citrus aromas on mood, arousal and food choice