title: Health effects associated with foods characteristic of the Nordic diet: a systematic literature review.
abstract: BACKGROUND
  In preparing the fifth edition of the Nordic Nutrition Recommendations (NNR), the scientific basis of specific food-based dietary guidelines (FBDG) was evaluated.
  
  
  OBJECTIVE
  A systematic review (SR) was conducted to update the NNR evidence based on the association between the consumption of potatoes, berries, whole grains, milk and milk products, and red and processed meat, and the risk of major diet-related chronic diseases.
  
  
  METHODS
  The SR was based on predefined research questions and eligibility criteria for independent duplicate study selection, data extraction, and assessment of methodological quality and applicability. We considered scientific data from prospective observational studies and intervention studies, published since year 2000, targeting the general adult population. Studies of meat and iron status included children, adolescents, and women of childbearing age.
  
  
  RESULTS
  Based on 7,282 abstracts, 57 studies met the quality criteria and were evidence graded. The data were too limited to draw any conclusions regarding: red and processed meat intake in relation to cardiovascular disease (CVD) and iron status; potatoes and berries regarding any study outcomes; and dairy consumption in relation to risk of breast cancer and CVD. However, dairy consumption seemed unlikely to increase CVD risk (moderate-grade evidence). There was probable evidence (moderate-grade) for whole grains protecting against type 2 diabetes and CVD, and suggestive evidence (low-grade) for colorectal cancer and for dairy consumption being associated with decreased risk of type 2 diabetes and increased risk of prostate cancer. The WCRF/AICR concludes that red and processed meat is a convincing cause of colorectal cancer.
  
  
  CONCLUSIONS
  Probable (moderate) evidence was only observed for whole grains protecting against type 2 diabetes and CVD. We identified a clear need for high-quality nutritional epidemiological and intervention studies and for studies of foods of the Nordic diet.
authors.affiliation: Nutritional Epidemiology Unit, Institute of Environmental Medicine, Karolinska Institutet, Stockholm, Sweden.
authors.forename: Agneta
authors.initials: A
authors.lastname: Akesson
authors.forename: Lene F
authors.initials: LF
authors.lastname: Andersen
authors.forename: Asa G
authors.initials: AG
authors.lastname: Kristjánsdóttir
authors.forename: Eva
authors.initials: E
authors.lastname: Roos
authors.forename: Ellen
authors.initials: E
authors.lastname: Trolle
authors.forename: Eeva
authors.initials: E
authors.lastname: Voutilainen
authors.forename: Elisabet
authors.initials: E
authors.lastname: Wirfält
keywords: Nordic Nutrition Recommendations; berries; food-based dietary guidelines; meat; milk; potatoes; systematic literature review; whole grains