Does diabetes mellitus increase the requirement for vitamin C?

Area of Science:

• Nutrition Science
• Endocrinology
• Biochemistry

Background:

• Diabetes mellitus is a metabolic disease associated with various complications.
• Vitamin C (ascorbic acid) is an essential nutrient with antioxidant properties.
• The relationship between diabetes mellitus and vitamin C status requires further investigation.

Purpose of the Study:

• To review scientific evidence on vitamin C status in people with diabetes mellitus.
• To determine if individuals with diabetes have increased dietary vitamin C requirements.
• To assess the impact of vitamin C supplementation on health outcomes in diabetes.

Main Methods:

• Systematic review of English language articles from 1935 to present.
• Included studies comparing ascorbic acid concentrations in diabetic and non-diabetic individuals.
• Included studies assessing vitamin C supplementation effects in diabetes.

Main Results:

• Most studies indicate significantly lower circulating ascorbic acid concentrations (at least 30% lower) in people with diabetes mellitus.
• Vitamin C supplementation showed minimal effect on blood glucose levels.
• Supplementation demonstrated a reduction in cellular sorbitol concentrations and capillary fragility.

Conclusions:

• Individuals with diabetes mellitus frequently exhibit suboptimal vitamin C status.
• While not impacting blood glucose, vitamin C supplementation may offer benefits in reducing specific diabetes-related complications.
• Methodological limitations in past research necessitate high-priority randomized clinical trials to clarify the role of ascorbic acid in diabetes management.