4. On the first trial day of these two periods patients will have blood samples taken to analyse creatin kinase, cholestrol, triglycerides, lipoproteins, total long-chain fatty acids, total carnitine, acylcarnitines, bilirubin, creatinin, aspartate amino transferase (ASAT), alanine amino transferase (ALAT), γ glutamyl transferase and alcalic phosfatase.