Diabetics (both Type 1 and Type 2) need more than an average amount of Vitamin C. Vitamin C is needed because it helps to lower the level of Sorbitol in the system. Sorbitol can accumulate in the diabetic's body and can cause damage to the kidneys, nerves and eyes. It may also assist Type 2 Diabetes sufferers by improving their glucose tolerance.
The delivery of vitamin C in the diabetics diet is assisted by insulin. Some medical and nutrition experts think the decrease in this delivery of vitamin C may the culprit for the vascular disturbances experienced by most diabetics.