Questionnaire: All patients will answer a password-protected questionnaire at baseline, surgery, and after 3 months, weight and height will be measured. Once during the 6-weeks period a 24-h recall interview will be performed, in which participants food intake during the preceding 24 h will be registered. The individual intake of energy and specific nutrients will be estimated by linking information from the questionnaire and diet record to the National Food Agency's nutritional database and our previously developed phytoestrogen database.