The study is a randomized controlled eight-week intervention study. Suitable participants currently being prescribed ONS and who meet the study inclusion and exclusion criteria, will be identified by either staff in care facilities, Registered Dietitians or by General Practitioner (GP) surgeries. Participants (n=80) will be stratified based on BMI and gender and randomly assigned to either the biscuit ONS group (n=40) or to remain on their existing ONS prescribed as part of their standard care practice (n=40). Changes in anthropometry, functional status, nutritional intake and appetite, general health, gastrointestinal symptoms and biochemistry (correction of nutritional deficiency), as well as compliance and acceptability of ONS will be assessed between week 0 and week 8. Participants will also be visited mid-intervention (week 4) to ensure well-being and assess compliance.