The primary objective of the study is to assess gastrointestinal (GI) tolerance (bowel frequency and consistency using the Bristol Stool Chart, nausea, vomiting, abdominal discomfort, wind, burping, flatulence) to a Test Oral Nutrition Supplement (EnergieShake®, a powdered nutritional supplement, classified as a Food for Special Medical Purposes for the dietary management of disease-related malnutrition) in patients requiring ONS.