胰岛素不仅仅负责将血糖运送到细胞，还担负着“护航”维生素C的任务。糖尿病患者血中的葡萄糖就如同公交车上赖着座位不起来的乘客一样，以至于影响了维生素C的吸收——这是GAA理论的假设前提：高血糖水平会阻碍维生素C进入细胞。
　　维生素C对于代谢中的整个身体来说都具有非常重要的意义。血糖和维生素C进入细胞的途径是相似的。两者都需要胰岛素的协助，由胰岛素携带葡萄糖与维生素C跨过细胞的过程被称为“胰岛素介导摄取”，改过程需要白细胞的参与。白细胞拥有更多的胰岛素泵，而且他们可以容纳是普通细胞20倍数量的维生素C。

　　那么，提高机体的维生素C水平是否可以帮助血糖的控制呢？《糖尿病健康》（美国）援引了一个学术研究的报告，该报告称，每日摄取2000mg剂量的可吸收酸能够同时改善2型糖尿病患者的餐前血糖水平和糖化血红蛋白指标。

　好，下次去药店的时候，不妨尝试一下，看看维生素Ｃ能不能帮你更好地控制血糖。

Insulin not only moves glucose into the cells, but it also escorts Vitamin C. Blood sugar hogs the seats on the bus in most diabetics, therefore reducing the amount of Vitamin C we can absorb. This is the premise of The GAA Theory: high glucose levels hinder vitamin C entry into cells.

Vitamin C is vitally important for many functions throughout the body - a big one being metabolism. Glucose and Vitamin C are similar in the way they enter the cells. Both molecules require help from insulin. The name for the process that brings glucose and Vitamin C through cell membranes is insulin-mediated uptake. The insulin-mediated uptake of glucose and vitamin C uses white blood cells. White blood cells have more insulin pumps and they may contain 20 times the amount of vitamin C as ordinary cells.

So does increasing your Vitamin C help boost your glycemic control? Diabetes Health cited a study that confirms daily doses of 2,000 mg of absorbic acid improved both fasting blood glucose and HbA1c readings in patients with type 2 diabetes. Next time you swing by the store - see if some Emergen-C can help you achieve better glycemic control. With 1,000 mg of Vitamin C per packet - their homepage says: Feel The Good. Little did they know how good it could be for Type 2 diabetics!