“Only 23% of adolescents estimated daily carbohydrate within 10 grams of the true amount despite selection of common meals. For dinner meals, individuals with accurate estimation of carbohydrate grams had the lowest A1C values” (Bishop et al., 2009)
Bishop, F., Maahs, D., Spiegel, G., Owen, D., Klingensmith, G., Bortzov, A., … Mayer-Davis, E. (2009). The carbohydrate counting in adolescents with type 1 diabetes (CCAT) study. Diabetes Spectrum, 22(1), 56-62.
Borushek, Allan. (2012) The calorie king calorie & fat carbohydrate counter. Costa Mesa, CA: Family Health Publications.