The evolving landscape of esports has placed increasing emphasis on the role of nutrition and health in optimising performance. This chapter explores the limitations of traditional weight-based health assessments, emphasising the importance of body composition, metabolic health, and individualised nutrition strategies for esports athletes. It outlines key principles of energy balance, macronutrient metabolism, and body composition assessment, offering practical methods for tracking energy expenditure. Recognising that knowledge alone does not drive change, the chapter introduces behavioural strategies such as the Transtheoretical Model and Motivational Interviewing to support sustainable nutrition interventions. Additionally, the integration of emerging technologies, including AI-driven dietary coaching and self-monitoring tools, highlights the future of esports nutrition. By combining evidence-based nutritional strategies with personalised interventions, esports athletes and coaches can foster long-term health and performance optimisation.