In a review of studies comparing different types of low-GI and high-GI foods and glucose responses, glucose peaks occurred consistently at ~30 minutes, regardless of whether the food was categorized as low-GI, medium-GI, or high-GI, with a modest difference in glucose peak values between high-GI and low-GI foods.26 The authors concluded that low-GI foods do not produce a slower rise in blood glucose nor do they produce an extended, sustained glucose response.