Nausea or vomiting in pregnancy (NVP) are among the commonest symptoms experienced in early pregnancy. We wanted to evaluate the association of dietary fibre intake, lifestyle characteristics and bowel function with NVP. One hundred and eighty-eight participants completed a self-administered questionnaire concerning bowel function, dietary fibre intake and lifestyle characteristics. Women suffering from NVP ( = 91) consumed significantly more fibre derived from cereal products (=.026) and total fibre (=.043) during pre-pregnancy period was compared to women without NVP ( = 97). In both groups, intake of total fibre and fibre derived from fruit and vegetables increased significantly during the first trimester. Dietary fibre intake did not protect from NVP. However, women suffering from NVP were able to maintain their fibre intake. Dietary fibre is tolerated well during NVP, and this finding can be used when giving diet counselling to women suffering from NVP.Impact statement Nausea or vomiting in pregnancy (NVP) are among the commonest symptoms experienced in early pregnancy. The pathophysiology of NVP remains unknown, but it has been suggested to be multifactorial. Diet during pregnancy may have an impact on NVP. It is generally advised to avoid meat, poultry, fish, eggs and spicy and fatty foods during periods of NVP, but there is limited data on the effects of diet of NVP. Women suffering from NVP have been shown to eat less meat (and thus protein) compared to women without NVP. Dietary fibre reduces constipation and heartburn and it also keeps blood glucose levels stable. Because of various beneficial effects of fibre on the digestive system, we hypothesised that a high fibre intake may alleviate the symptoms of NVP. The aim of the present study was to investigate whether the amount or source of dietary fibre are associated with NVP. We wanted to investigate intake of fibre derived from cereal products (mostly representing insoluble fibre) and fibre derived from fruit and vegetables (containing mostly soluble fibre) separately in relationship to NVP, as the mechanisms of action of these fibre groups are different. There are no observational studies including also pre-pregnancy consumption of fibre when focussing on the association between fibre and NVP. The results of this study can be used when giving diet counselling to women suffering from NVP.