Controls
Healthy controls were recruited via local advertisements at Aker University Hospital. Between January and May 2007, 58 nonobese subjects (30 women) aged 19 –59 y were examined. Exclusion criteria included chronic disease and regular medica- tion or multivitamin supplement use. Subjects using contracep- tive medication (n 10) or thyroxine substitution (n 4) were allowed to participate.