Table 1.

PICO criteria for the present umbrella meta-analysis of randomized controlled trials.

Items	Descriptions
Participants	Subjects who were treated with dietary fiber
Intervention	Dietary fiber or other conditions*
Comparator	Placebo or control group or low dietary fiber intake
Outcomes	Parameters involved with blood glucose or blood lipids or blood pressure or inflammatory factors

^*Other conditions including resistant starch, cereal β-glucan, guar gum, inulin-type fructan, psyllium, glucomannan and brown rice.