Secondary endpoints
mass loss, weight loss
Secondary endpoints are total weight loss, fat mass loss, BMI, hand grip strength, total protein intake, and attribution of dietary protein intake to total protein intake, measured at baseline and 1, 3, 6, and 12 months of follow-up.Weight will be measured to the nearest 0.1 kg using the Seca® MBCA 515. Weight will be measured with light clothes on and without shoes and jackets. Height will be measured to the nearest 0.1 cm using a calibrated stadiometer. Height will be measured without shoes and patients will have to stand straight, with the heels against the wall and the face looking straight ahead.Fat mass will be measured in kilograms (kg) and will be assessed by the Seca® MBCA 515 in the same way as fat-free mass. Hand grip strength will be measured using a grip strength dynamometer. Patients will be asked to remove jewelry from their fingers and the procedure will be explained to patients. Patients will be instructed to sit down and to hold the arm at a 90-degree angle. The measurement will be repeated three times on both sides and patients are allowed to rest for a minute in between the measurements. The highest score will be used for analysis.Dietary protein intake will be assessed by using a 3-day food diary at baseline and on postoperative months 1, 3, 6, and 12. This method was chosen as it minimalizes recall bias and takes variations between week- and weekend days into account [