Sugar can weaken eyesight. Sugar raises the level of a neurotransmitter called serotonin, which can narrow blood vessels. Sugar can cause hypoglycemia. Sugar can produce an acidic stomach. Sugar can raise adrenaline levels in children.
Sugar can increase the risk of coronary heart disease.
Sugar can speed the aging process, causing wrinkles and grey hair. Sugar can lead to alcoholism. Sugar can promote tooth decay. Sugar can contribute to weight gain and obesity. High intake of sugar increases the risk of Crohn's disease and ulcerative colitis.