G-Computation Quantifying Caries Reduction by World Health Organization Sugar Limits in Children.
Level 3 - non-randomized controlled study
Prospective birth cohort study using counterfactual causal modeling (G-computation).
PubMed 41562134 · doi:10.1177/00220345251406559
What was done
Researchers analyzed data from 2,182 Australian children in the SMILE birth cohort. G-computation was used to model counterfactual decayed, missing, and filled tooth surfaces (dmfs) at age 5 years if free sugar intake (FSI) at age 2 years had been restricted below 10% or below 5% of the estimated energy requirement (EER). Dose-response relationships were also evaluated using restricted cubic splines on continuous FSI.
What was found
For the general preschool population, simulated reduction of FSI to <10% or <5% of EER produced absolute reductions in dmfs of 1.3 and 1.5, respectively, with attributable fractions among the exposed (AFE) of 84% and 97%. In high-risk children, absolute reductions reached 4.4 to 4.5 dmfs, with AFEs of 75% to 99%. Dose-response modeling identified a threshold around 6.25 g/day (2.5% of EER) where dmfs increased most steeply.
Why it matters
These findings quantify the expected dental health gains from adhering to World Health Organization sugar limits and suggest that the risk of early childhood caries begins to rise at thresholds even lower than current guidelines, especially for high-risk children.
Limits
The study is based on observational cohort data from a single high-income country (Australia) with potential unmeasured confounding and dietary recall bias. Sugar intake was modeled based on a single time point (age 2 years) rather than continuous lifetime exposure.
Cited by
- supports The World Health Organization recommends limiting sugar intake to 25 grams per day.