In March 2019 researchers from China published their review of the medical scientific literature to assess the effect of dietary ginger on fasting blood sugar and HbA1c levels in individuals with diabetes type 2. Ginger (Zingiber officinale), is a nontoxic spice with very few side effects, and is considered safe by the FDA, the US regulatory authority. A total of 8 studies involving 454 individuals with diabetes type 2 were included in the review. The amount of ginger consumed was between 1600-4000 mg daily. Results showed that the consumption of ginger had no significant effect on the fasting blood sugar levels. However, ginger consumption did appear to significantly improve HbA1c levels.
Huang FY et al. Dietary ginger as a traditional therapy for blood sugar control in patients with type 2 diabetes mellitus: A systematic review and meta-analysis. Medicine (Baltimore). 2019 Mar;98(13):e15054.