The purpose of this experimental study is to investigate whether an acute lipid infusion added marine n-3 fatty acids produces effects on insulin sensitivity in subjects with type 2 diabetes, when compared with an acute lipid infusion without marine n-3 fatty acids. Furthermore other effects on intermediary metabolism are tested for.

Evidence indicates that n-3 fatty acids exert several beneficial effects. However, the effects of marine n-3 fatty acids on intermediary metabolism have not been completely elucidated. In a previous study of a high intake of marine n-3 fatty acids during 9 wk we demonstrated reduced insulin sensitivity and altered proportion of carbohydrate vs. fat oxidation in subjects with type 2 diabetes. These results question the use of high doses of n-3 supplements in type 2 diabetes. It is not known to what extent such effects in type 2 diabetes can be reproduced by intravenous administration of n-3 fatty acids and/or whether short term intravenous administration has other effects.

Inclusion Criteria:

• Type 2 diabetes defined by clinical criteria and by absence of antibodies to glutamic acid decarboxylase.
• HbA1c 5,5 - 8,5 %
• Blood pressure ≤ 170 mm Hg systolic and/or ≤ 105 mm Hg diastolic

Exclusion Criteria:

• insulin treatment
• hypertriglyceridemia (> 2,1 mmol/l TG)
• proliferative retinopathy, renal insufficiency (Se-Creatinine > 150 μmol/l)
• alcoholism, congestive heart failure or other serious diseases affecting the possibility of the subject to participate
• supplement with fish oil or marine n-3 fatty acids during the last 6 months before baseline
• Dicumarol treatment
• allergy to soya, fish or egg
• pregnancy or lactation
• smoking