Nutrigenomics (nutritional genomics) is the application of the sciences of genomics, transcriptomics, proteomics and metabolomics to human nutrition, especially the relationship between nutrition and health. Nutrition and health research is focussed on the prevention of disease by optimising and maintaining cellular, tissue, organ and whole-body homeostasis. Nutrigenomics is associated with the issue of personalized nutrition, since claims are being made that differences in genotype should result in differences in the diet and health relationship.