Abstract Background Dietitians in clinical practice face the challenge of providing high quality care whilst demonstrating clinical effectiveness and continuous improvement. Assessing the effectiveness of dietetic intervention is vital in ensuring the provision of clinically effective dietetic services. Nutritional outcome measures are key in identifying the impact of dietetic interventions; enabling dietitians to objectively measure the effectiveness of their care as well as providing patients, other health care professionals and commissioners with data around the value of care provision. Currently there are no specific nutritional outcomes associated with oesophago-gastric cancer care in the UK. Methods A survey was disseminated through direct personal emails to 93 Dietitians known to be working in UGI, a list derived from NOGCA audit sites of 2021, with the aim of assessing the current use of nutritional outcome measures by Dietitians working in oesophago-gastric cancer acute care in the British Isles. Further promotion was directed through a UGI Dietitians Forum and through social media posts. A YouTube video was produced and distributed alongside the survey, with the aim of providing education around identifying nutritional outcomes. The video also aimed to connect personally with people, with a visual presentation from the researcher. Results 54 responses represented the entire patient journey. Whilst 72% of respondents reported identifying and documenting dietetic outcomes, the quality of these assessments was low, mainly focusing on weight, weight changes and hand grip strength. Other common themes related to nutritional intake, quality of life and symptom impact. Less common outcomes measured included standardised nutritional assessment (PG-SGA), gastro-intestinal symptom evaluation, optimised prehabilitation, biochemical parameters and patient experience. There was little standardisation in how outcomes are used and when they were taken. There is no national database available to collate OG nutritional outcome data, representing a missed opportunity to support national benchmarking. Conclusions This study has presented not only the inconsistencies in nutritional outcome data collection (definition, timing and tools) and the need for standardisation of outcomes use in this speciality, it has also demonstrated the challenges around the promotion of outcomes measures and application/roll out into clinical practice. Novel ways of obtaining and evaluating nutritional outcomes will need to be considered. This will form the basis of a further research study, exploring barriers to completion of nutritional outcomes.