Logic of the vitamin D fortification model. The three axes depict the logic of each fortification intensity scenario considered in our model. The x-axis – vitamin D intake – represents daily vitamin D intake through natural food sources as well as supplements. While individuals of the 95th (zero point) percentile already have a high vitamin D intake, individuals of the 5th percentile (furthest from zero point) still have a low vitamin D intake. The more vitamin D an individual already consumes, the lower the calculated fortification intensity in our model.
Brown et al. Nutrition Journal 2013 12:151 doi:10.1186/1475-2891-12-151