The aim of the present analysis was to evaluate the effect of intake of added sugars on intakes of nutrients and food groups. We used a mixed linear model (PROC MIXED) to analyse data from the Dortmund Nutritional and Anthropometric Longitudinally Designed (DONALD) study (an ongoing longitudinal cohort study between infancy and adulthood). Between July 1985 and August 2001, 3 d weighed dietary records (n 4993) from 849 children and adolescents (416 male, 433 female) aged 2–18 years were collected and evaluated. Overall mean intake of added sugars was 12·4 (SD 5·3) (median 12·0) % energy. Fat intake (% energy) and intake of all analysed nutrients (as % reference values for nutrient intakes) fell across quintiles 1–5 of energy intake from added sugars (P<0·001). With the exception of ‘Sugary foods’ and ‘Beverages’ (significant increase, P<0·0001) and ‘Dairy’ (NS), intake of all other food groups decreased with increasing intake of added sugars (P<0·0001). In conclusion, we found a slight, but statistically significant, nutrient-dilution effect of added sugars and a significant reduction in intake of important nutrient-bearing food groups. However, the DONALD study gives no clear indicator on grounds of micronutrient dilution for a quantitative limit on intake of added sugars.