Another study shows that ginger affects blood sugar, but not insulin levels. Although it's not clear, the conflicting results may be due to the dose of ginger used or the length of time the patients had been diagnosed with diabetes. Upset stomach (dyspepsia). Research suggests that taking a single dose of 1.2 grams of ginger root powder one hour before eating speeds up how quickly food empties out of the some in people with dyspepsia.