McArdle PD, et al. - Using data collected via a search of the Medline, EMBASE and CINAHL databases (between 1976 and April 2018), researchers studied the impact of carbohydrate restriction on glycemic control among people with type 2 diabetes. Of the 1,402 randomized controlled trials identified, 25 met the inclusion criteria, incorporating 2,132 participants for the main outcome. Overall, no overall pooled effect on HbA_1c was found in support of restricting carbohydrate. However, restricting carbohydrates to 50–130 grams daily had beneficial effects on HbA_1c in trials of up to 6 months.