Table 1.

Selection criteria based on population, intervention, comparator, and outcomes (PICO) framework.

PICO Framework	Inclusion Criteria	Exclusion Criteria
Population	Adults (18–75 years) with T2D	Studies involving patients with either T1D, gestational diabetes, animal studies
Intervention	(i)Low-GI/GL (ii)Reduced CHO (resulting in lower GL) (iii)Increased soluble fiber content (resulting in a lower GI)	Ketogenic diets, studies with no data of GI value of meals or no data on CHO content of meals
Comparator	Higher GI/GL diets and/or control	Studies using medical treatment as comparator
Outcomes	Postprandial glucose response	Studies not involving postprandial glucose measurements
Types of study	RCTs	Reviews, books, comments, qualitative studies

T1D-type 1 diabetes, T2D-type 2 diabetes, GL-glycemic load; GI-glycemic index; RCT-randomized control trials:CHO- carbohydrates.