Oliver’s research experience and expertise can be organised into two strands. The first strand focuses on non-pharmacological interventions — namely physical activity and diet — for improving metabolic health in humans. The geriatric condition termed sarcopenia is of particular interest to Oliver. As a first step, Oliver is interested in why we all lose muscle mass and quality as we get older. While, as a research community, we understand that multiple, inter-related factors mediate the age-related loss of muscle mass and function, several complexities remain unresolved. As such, the ‘holy grail’ for Oliver (and other scientists in the field) is the discovery of novel nutritional interventions to offset age-related deteriorations in muscle physiology. In this regard, protein nutrition sourced from both animal (dairy) and plant origin has been central to Oliver’s research. Strand 2 of Oliver’s research is focused on achieving marginal gains in athlete performance, investigating the interaction of diet and exercise for optimising training adaptation, body composition and performance in highly trained sports men and women. Although these population groups sit at opposite ends of the health spectrum, there is much we can learn about metabolic disease by taking finely tuned athletes out of their comfort zone, and vice versa.