Nutrigenomics connecting dietary components and the genome to address nutritional challenges, has emerged as a transformative approach to illness prevention and management. It allows for personalized recommendations for diet based on individual-specific genetic profiles by evaluating how nutrients influence gene expression via epigenetic alterations (like DNA methylation and histone remodeling) and transcriptional control. Precision nutrition studies molecular pathways vital in chronic diseases such as heart disease, type 2 diabetes, cancer and obesity. Identifying individuals with a genetic predisposition to dyslipidemia, for example, would benefit from omega-3 fatty acid and fibre rich diets that alter lipid metabolism genes such as APOE, lowering cardiovascular risk. Similarly, understanding carbohydrate metabolism genes like GCKR enable targeted therapies would enable to control blood glucose levels in prediabetic people. Curcumin and retinoids have been shown to decrease pro-inflammatory genes (e.g., TLR4, NF-κB) and enhance carcinogen-detoxifying pathways, providing potential chemo-preventive techniques. Advancements in metabolomics and transcriptomics, make it simpler to identify and target genetic variations (for example, FTO in obesity) that alter nutrient metabolism, enabling more tailored weight management strategies. Also, nutrigenomics studies the interrelation of gut microbiome data and dietary parameters to recognize microbial control of nutrient bioavailability and immune responses. However, standardizing genetic testing and addressing ethical considerations still continue to emerge. Large scale clinical studies continue to validate gene-diet interactions and improve public health frameworks for implementing personalized nutrition, which would be an effective initiative in future research.