Percentage of US ready-to-eat (RTE) cereal eaters above the Tolerable Upper Intake Level (UL) for nutrients fortified in RTE cereal under three scenarios: baseline (), zero fortification () and optimized fortification (): (a) toddlers aged 1–3 years, n 237; (b) children aged 4–12 years, n 589; (c) adolescents aged 13–18 years, n 247; (d) adults aged ≥19 years, n 921. Data are from the National Health and Nutrition Examination Survey (NHANES) 2013–2014. The baseline scenario is the current nutrient intake; for the zero-fortification scenario, we modelled removing all fortification of the nutrients listed in this figure. In the optimized fortification scenario, we modelled fortification levels of 10 % of the Daily Value for vitamins A, C and D, riboflavin, niacin and calcium, and 20 % of the Daily Value for thiamin, vitamins B6 and B12, folic acid, iron and zinc. Values are percentages with their standard errors indicated by vertical bars