Hen nutrition is crucial for optimising egg quality. Hen's weight at point of lay, energy and protein densities of the diets, amino acid and fatty acids contents but also the mode of feed delivery throughout the day affect egg weight and also, but to a lesser extent, the proportion of yolk and albumen. Egg profile in fatty acid and in trace elements (iodine, selenium, manganese) and fat-soluble vitamins (E, D, A and K) reflects the dietary supply of these nutrients. The yolk colour also depends on the dietary carotenoids even if effectiveness of colouring varies according to the source of the xanthophyll. Finally, this chapter describes the effects of dietary calcium and other minerals and vitamins on shell strength.