The semi-structured phone interviews have the purpose to shed light on the difficulties participants encountered while following the intervention. The self developed questionnaire (adapted from Hoogland J et al. 2019) uses a semi-structured approach and consists of 10 questions: Have you forgotten to consume ONS in the last 7 days? What is the usual dose per day you have taken in the last 7 days? When do you consume the drinkable food? How and when do you usually consume the ONS? Have you forgotten to exercise in the last 7 days? Did you complete the entire exercise session, or did you skip some exercises? What were the reasons that made it difficult to start or finish an exercise session in the last 7 days? How many minutes did it take to do the exercises per day? Do you feel stronger now than before you started the exercise and nutrition program? Do you feel less likely to fall now than before you started the exercise and nutrition program?

The semi-structured phone interviews have the purpose to shed light on the difficulties participants encountered while following the intervention. The self developed questionnaire (adapted from Hoogland J et al. 2019) uses a semi-structured approach and consists of 10 questions: Have you forgotten to consume ONS in the last 7 days? What is the usual dose per day you have taken in the last 7 days? When do you consume the drinkable food? How and when do you usually consume the ONS? Have you forgotten to exercise in the last 7 days? Did you complete the entire exercise session, or did you skip some exercises? What were the reasons that made it difficult to start or finish an exercise session in the last 7 days? How many minutes did it take to do the exercises per day? Do you feel stronger now than before you started the exercise and nutrition program? Do you feel less likely to fall now than before you started the exercise and nutrition program?

Changes in nutritional status will be measured using the MNA-LF(Mini Nutritional Assessment Long Format).

The MNA-LF scale ranges from 0-30 points: 24-30 points: normal status, 17-23.5 points: risk for malnutrition, <10 points: malnutrition.

For evaluation of muscle mass, Bioelectrical impedance analysis (BIA) is performed in all included patients using a BIVA 101® (Akern, SMT medical GmbH, Würzburg, Germany). It measures the apendicular muscle mass. The cut-off values for sarcopenia are: ♂< 20 kg, 7 kg/m2, ♀ < 16 kg, 5.5 kg/m2.

For evaluation of muscle mass, Bioelectrical impedance analysis (BIA) is performed in all included patients using a BIVA 101® (Akern, SMT medical GmbH, Würzburg, Germany). It measures the apendicular muscle mass. The cut-off values for sarcopenia are: ♂< 20 kg, 7 kg/m2, ♀ < 16 kg, 5.5 kg/m2.

Quality of life will be measured with the EQ-5D-3L questionnaire intepreted according to the EuroQol guidelines.

Quality of life will be measured with the EQ-5D-3L questionnaire intepreted according to the EuroQol guidelines.

The Short Physical Performance Battery (SPPB) is a group of measures that combines the results. of the gait speed, chair stand and 3 balance tests (Guralnik et al., 2000). It has been used as a predictive tool for possible disability and can aid in the monitoring of function in older people. Scores range from 0 to 12 points, ≤ 9 points indicate physical frailty, ≤ 8 points indicate severe sarcopenia, ≤ 3 points indicate severe limitations in the activities of daily living.

The Short Physical Performance Battery (SPPB) is a group of measures that combines the results. of the gait speed, chair stand and 3 balance tests (Guralnik et al., 2000). It has been used as a predictive tool for possible disability and can aid in the monitoring of function in older people. Scores range from 0 to 12 points, ≤ 9 points indicate physical frailty, ≤ 8 points indicate severe sarcopenia, ≤ 3 points indicate severe limitations in the activities of daily living.

Hand grip strength is assessed using a Martin Vigorimeter. The Martin Vigorimeter is a pseudodynamic dynamometer that measures the pressure when subjects press a rubber bulb connected by a tube to a manometer, with pressure being expressed in kiloPascal (kPa). Higher scores mean a better outcome. Cut-off points for poor muscle strength in the assessment for sarcopenia are: female 27 kPa, male 45 kPa.

Hand grip strength is assessed using a Martin Vigorimeter. The Martin Vigorimeter is a pseudodynamic dynamometer that measures the pressure when subjects press a rubber bulb connected by a tube to a manometer, with pressure being expressed in kiloPascal (kPa). Higher scores mean a better outcome. Cut-off points for poor muscle strength in the assessment for sarcopenia are: female 27 kPa, male 45 kPa.

The timed up and go (TUG) assessment assesses functional ability and mobility. The probands start the assessment in a seated position, then stand up upon the assessor's command, walk 3 meters, turn around, walk back to the chair and sit down. Time measurement (seconds) starts when the back of the participant leaves the backrest and is stopped when is back seated. An older adult who takes ≥12 seconds to complete the TUG is at risk for falling. Lower scores indicate better outcomes. ≥20 seconds to complete the TUG indicate severe sarcopenia.

The timed up and go (TUG) assessment assesses functional ability and mobility. The probands start the assessment in a seated position, then stand up upon the assessor's command, walk 3 meters, turn around, walk back to the chair and sit down. Time measurement (seconds) starts when the back of the participant leaves the backrest and is stopped when is back seated. An older adult who takes ≥12 seconds to complete the TUG is at risk for falling. Lower scores indicate better outcomes. ≥20 seconds to complete the TUG indicate severe sarcopenia.