This Deliverable report follows-on from TRUE Deliverable 5.5, The Environmental Assessment of Diets (Williams et al., 2020) and provides a combined environmental and nutri-economic analysis of both the 'Irish Diet' and EAT-Lancet Commission ‘Reference (planetary healthy) Diet’, where food items, categories and diet have been costed not only in terms of price to the consumer, but also in terms of nutrition and environmental burden. The Irish Diet is used as an example of how increasing the intake of low environmental impact sustainable foods can significantly lower per capita per day food costs, increase nutritional quality and reduce environmental burdens.