2.4. Assessment of the economic cost of diet
The Household Consumption Database of the Spanish Ministry of Agriculture, Fisheries and Food (Then, the price of the diet was further adjusted by energy density to avoid bias due to amount of food consumed. The more food one eats the more the diet costs. Hence, data were adjusted by energy intake as an indicator of both, the amount of food consumed and energy requirements. Therefore, data in this study are expressed in €/1,000 kcal/day.It was not possible to calculate the economic cost of the diet for 36 subjects, and accordingly, they were excluded. Therefore, 6,838 subjects were included in this study, as shown in 