BackgroundMalnutrition is underdiagnosed in primary care. GPs are key healthcare contacts for older adults at risk of protein-energy malnutrition; however, lack of knowledge and confidence in its diagnosis and treatment is often reported.AimTo evaluate the impact of a bespoke online education module on GP malnutrition knowledge and management.Design & settingA prospective pre—post pilot study with 23 GPs and eight GP trainees in the Republic of Ireland.MethodThe module included units on the following: ‘malnutrition definition, prevalence, and latest evidence’; ‘identifying malnutrition in clinical practice’; ‘food-first advice’; ‘reviewing malnutrition’; and ‘oral nutritional supplements’. Participant knowledge was measured using a multiple choice questionnaire (MCQ) before and after the module (n= 31), and 6 weeks following completion (n= 11). Case studies assessing identification and management of malnutrition were evaluated by a clinical specialist dietitian with expertise in managing malnutrition. Changes in assessment performance were calculated using pairedt-tests. Acceptability was evaluated using a questionnaire.ResultsPost-training, 97% of GPs increased MCQ scores from baseline (+25%,P<0.001), with the greatest improvement in ‘identifying malnutrition in clinical practice’ (mean increase 47%,P<0.001). Eleven GPs completed the 6-week MCQ with scores remaining significantly higher than baseline (mean increase 15%,P= 0.005); ‘identifying malnutrition in clinical practice’ remained the most highly scored (mean increase 40%,P<0.001). Seventeen GPs completed the case studies; 76% at baseline and 88% post-module correctly calculated malnutrition risk scores. Appropriate malnutrition management improved for 47% of GPs after module completion.ConclusionThis e-learning module improved malnutrition knowledge, with good short-term retention in a small cohort. Development of online evidence-based nutrition education may improve GP nutrition care.