Fig. 1

Study overview of participants. Participants not complying with the protocol were not included in the statistical analyses. Non-compliance was defined as not following the protocol in regard to fish intake (omitting more than 3 fish dinners in the fish-eating groups), other dietary changes or use of prescription medicine not compatible with the inclusion criteria, or changes in physical activity. *Of these, two participants (one man and one woman) in the Cod group were selected for faeces collection. †Of these, one participant (a woman) in the Control group was selected for faeces collection. ‡Of these, one participant (a woman) selected for faeces collection in the Cod group was excluded from analysis