It may not raise your blood sugar as quickly as plain white rice. Pairing brown rice with black beans may also lessen the spike in blood glucose, since black beans have a GI rating of about 30. Plan your meals accordingly and include low glycemic index foods with your side of rice to avoid a surge in your blood sugar.his part of the rice grain is full of nutrients and is lower on the glycemic index than traditional forms of rice. Converted rice has a glycemic index of about 38, making it much lower on the GI scale than white or brown rice.