The problem isn’t carbonation. The problem is carbonated sugary drinks typically have more sugar than other sugary drinks. The typical soda has 38g of sugar per 12oz (can). Coca-Cola is 45g. Mountain Dew is 46g. Redbull and Monster are 34g. Anything over 28g is no go territory for me. Anything under is generally not an issue blood sugar wise for me. Note: I am not diabetic.