Understanding mechanisms that define the relationship between diet, physiology, and ageing holds great promise to improve human health despite the complexity of these relationships. Traditional dietary approaches have usually focussed on ‘one-nutrient-at-a-time’ rather than considering the entire nutrient and dietary landscape. In this talk I will discuss how we have employed an integrative approach called the Geometric Framework for Nutrition (GFN) to explore in unprecedented detail the ways that nutrients and their interactions influence the multiple dimensions of phenotype (spanning molecular interactions to life-history traits) across life.