In the study, which was conducted by researchers from the University of Gothenburg, Sahlgrenska University Hospital and the Norwegian Institute of Public Health, the participants completed a scientifically evaluated questionnaire about what they had been eating and drinking since becoming pregnant.
The researchers also had access to information about the women's general lifestyle e.g. level of education, living conditions, income, weight, physical activity, smoking habits, alcohol consumption, number of children and medical factors such as history of preterm delivery.