Empirical evidence regarding the influence of environmental factors on physical activity and dietary behavior is growing rapidly. The evidence-base, however, is typically built on (cross-sectional) observational studies. There is a dearth of studies that apply environmental manipulations (interventions) in the examination of changes in physical activity and dietary behavior. Relatively small changes in environmental cues may induce relatively large behavioral changes. Experimental studies that have used environmental manipulations in the promotion of stair use, for example, have shown that environmental prompts increase the percentage of people using the stairs. This special issue is devoted to the intervention approaches that alter the social or physical environment to make physical activity and/or healthy dietary behavior more likely. Such environmental changes, sometimes referred to as “nudges,” might include strategies such as environmental prompts, labeling of healthy food, providing social norm feedback, changing the defaults that surround the serving of food and drinks, or altering the layout of buildings to reduce sedentary behavior or to cue physical activity. The Call for Papers welcomes studies that have tested the impact of environmental manipulations as cues for physical activity and/or healthy dietary behavior. These studies preferably apply (natural) experimental research designs with objective outcome measures. Also informative pilot studies of innovative ideas are welcomed, as well as reviews, cost-effectiveness analyses, and theoretical reflections on working mechanisms and debate papers on the use of small environmental changes to promote physical activity and/or dietary behavior. Potential topics include, but are not limited to:

• Environmental changes to promote physical activity
• Environmental changes to reduce sedentary behavior
• Environmental changes to promote healthy dietary behavior
• Environmental changes to promote healthy lifestyle (including diet and/or physical activity)

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