It was the aim of this study to understand the differences between occasional organic consumers (OOC) and regular organic food consumers (ROC). A total of 571 consumers, interviewed directly after grocery shopping, were classified as conventional, occasional organic or regular organic consumers depending on the number of organically produced items bought. In order to gain encompassing insights on the differences between the ROC and OOC consumer groups, a large set of psychological and socio-demographic factors was studied. They differ with respect to general food choice motives with OOC placing significantly less importance on animal welfare, food security, environmental protection and more importance on caloric content, convenience and price compared to ROC; with respect to beliefs about the consequences of organic food consumption OOC expect greater expense, less choice, no increase in vitamins and no improvement in taste compared to ROC, and finally OOC show a less positive attitude, weaker social norms and lower intentions of buying organic food regularly in the future and give a lower importance in their lives to protection of the environment. OOC finally prefer different grocery stores and use a larger variety of stores than ROC.