The amount of vitamins they contain is of little importance. How fast sugar is absorbed into the blood stream depends on the source of sugar. When whole foods such as fruits are eaten, sugars are released slowly during digestion from the gut into the blood stream. When mainly sugar foods are eaten, such as a soda or candy bar, there is rapid absorption. This rapid absorption causes the blood sugar level to quickly rise, then fall.
Sugar has a bad reputation for causing many health problems.
There is no evidence that it causes hyperactivity. However, sugar is known to cause tooth decay and obesity when eaten in excess. People with diabetes and hypoglycemia need to watch how much sugar they eat. Hypoglycemia is an abnormally low level of blood glucose. A lack of insulin or the inability of the cells in the body to respond to insulin causes diabetes.