Randomized controlled trials involving both diabetic and nondiabetic subjects suggest that blood sugar control may be improved by adding two teaspoons of vinegar to a meal, effectively blunting the post-meal blood sugar spike by about 20 percent.805 So, the effects of these high-glycemic foods may be blunted by adding vinegar to rice (like the Japanese do to make sushi) or dipping bread in balsamic vinegar, for example.
