Nobody knows. The kind of randomized controlled experiments that would tell us have not been done. According to the people at the “Very Well Health” website, we know that having blood sugar higher than 140 two hours after eating is out of the normal range. This is a case where we don’t want to be just normal. We know that blood glucose does damage; what we don’t know is what level exceeds our body’s ability to recover from it. We know we need to spend time between meals in fat burning mode, which requires that glucose and insulin drop to baseline, preferably far more quickly than after two hours.