The article presents results from a survey that was carried out among participants in a strictly controlled dietary intervention trial in order to investigate and compare the social and cultural acceptability of three different diets. Measures of social and cultural acceptability included liking of diet, social eating events, practical matters surrounding shopping, cooking, eating, understandings of the relationship between diet type, bodyweight and health, and preferences for specific foods. The survey study focuses especially on the acceptability of the diet recommended by American epidemiologist Walter Willett. On most measures the results indicated that a diet based on Willett's recommendations had a generally high level of acceptability. Scepticism related primarily to the health and weight benefits of this diet in comparison with those of the present dietary recommendations in Denmark. The survey also revealed that participants attributed more influence on their body weight to the amount of food they ate than they did to the composition of the diets they followed. While the scope of the study does not allow for the generalizations of results to a general population level, the experimental design provides detailed insight into social and cultural aspects of experiences of strict dietary adherence.