The Effect of Oily Fish and Poultry on Children's Cardiometabolic Health and Cognitive Function

Inclusion Criteria: Children must: * Be 8 - 9 years of age at the start of the intervention * Be healthy * Like oily fish and chicken * Be willing to be randomized to eat fish or chicken * Not consume oily fish more than once per week 3 months prior to intervention start * Not consume fish oil 3 months prior to intervention start * Speak Danish in order to understand the study procedures Moreover: * Parents must read and speak Danish, in order to be properly informed about the study procedures * The child must live in a household with ≤5 persons Exclusion Criteria: * Serious chronic illnesses and diseases that may interfere with study outcomes * Diagnosed Attention Deficit Hyperactivity Disorder (ADHD) or other psychiatric illness * Intake of medication that may affect study outcomes * Concomitant participation in other studies involving dietary supplements or blood sampling * Living in a household with another participating child