The purpose of the present thesis was driven by the limited existing evidence examining nutritional and physical activity (PA) profiles of older migrant women, and the importance of such studies for the planning and development of appropriate strategies to promote healthy ageing. This thesis adopted a mixed-methods approach to explore current dietary intake, nutrient status, and key factors influencing dietary factors (Chapter 3) of first generation migrant older women from diverse ethnic, socio-economic, and migration backgrounds (n=76). Chapter 4 sought to explore if the reported low energy and low nutrient intakes found in Chapter 3 were associated with frailty. Chapter 5 examined the association between objectively measured PA/ST and frailty, and identified key factors influencing PA amongst a sub-sample of the study sample (n=60). Given that diet and PA are potential mediators to promote healthy ageing in this population, Chapter 6 explored experiences of ageing and how these, in turn, shaped participants’ perceptions of ‘good’ old age as well as nutrition and physical activity behaviours. The present thesis provided an opportunity to better understand the dietary and PA profiles of first generation migrant older women and how they relate to frailty and ageing within the contemporary super-diverse UK context.