‘You are what you eat’, the maxim made memorable thanks to Jean Anthelme Brillat-Savarin in 1826, is as important now as it was then. The vital role #diet plays in #health has been widely documented, but our understanding widely rests on the 150 #nutritional components tracked by national databases which only represent a small section of the 26,000 definable biochemicals in the food supply. This wide range of chemical diversity remains largely invisible both to us and to epidemiological studies, yet the number is only expected to rise as detection techniques improve, leading to a far greater understanding of the links between our diet and health.