In Ireland a study of Rothamsted Research shows that a more specified calculation of the environmental footprint of food changes the footprint of animal-based products like dairy beef to half or even less. For this Rothamsted Research calculated the footprint on base of the quality of the protein and measured this by the Digestible Indispensable Amino Acid Score (DIAAS). The researchers emphasise that the quantity of protein in a product does not represent the quality of the protein. For example some plant based products can contain stuffs that even can deteriorate digestion or uptake of a nutrient.