Interactions with oxygen should be limited in order to prevent quality losses in food products. This could be achieved by the application of edible films and coatings, whose action involves two mechanisms: the oxygen barrier effect and the specific activity of the incorporated antioxidant agents. In this sense, the efficiency of films and coatings is greatly affected by the water availability in the film. The increase in the film water content reduces the oxygenbarriereffect,but can enhance the chemical action of the antioxidants. For this reason, the moisture content of the foodstuff and the relative humidity in the ambient should be taken into account in order to develop effective films and coatings with antioxidant activity.