Certainty assessment							No. of patients		Effect		Certainty	Importance
No. of studies	Study design	Risk of bias	Inconsistency	Indirectness	Imprecision	Other considerations	Low-glycemic-index diets	Control diets	Relative (95% CI)	Absolute (95% CI)
Endpoint HbA1c
18	Randomized trials	Not serious	Seriousa	Not serious	Seriousb	None	720	745	–	MD 0.32% lower (0.45 lower to 0.19 lower)	⨁⨁◯◯ Low	Critical
Endpoint BMI
20	Randomized trials	Not serious	Not serious	Not serious	Seriousb	None	673	690	–	MD 0.38 kg/M2 lower (0.64 lower to 0.13 lower)	⨁⨁⨁◯ Moderate	Critical