Does vitamin D play a significant role in type 2 diabetes?

Area of Science:

• Endocrinology
• Metabolic Diseases
• Nutritional Science

Background:

• Vitamin D deficiency is frequently observed in individuals with type 2 diabetes mellitus (T2DM).
• The potential impact of 25-hydroxyvitamin D (25OHD) on glycemic control and insulin sensitivity in T2DM requires further investigation.

Purpose of the Study:

• To investigate the association between serum 25-hydroxyvitamin D (25OHD) levels and key diabetes markers: hemoglobin glycation (HbA1c) and homeostatic model assessment of insulin resistance (HOMA-IR).
• To determine if 25OHD deficiency significantly influences glycemic control and insulin resistance in subjects with T2DM.

Main Methods:

• A cross-sectional study involving 912 participants from Western India, including 429 T2DM cases and 483 non-diabetic controls.
• Assessment of biochemical parameters such as fasting plasma glucose (FBS), postprandial plasma glucose (PPBS), HbA1c, fasting insulin (FI), HOMA-IR, and serum 25OHD levels.

Main Results:

• A high prevalence of vitamin D deficiency was noted, affecting 91.4% of T2DM cases and 93.0% of control subjects.
• No statistically significant association was found between serum 25OHD deficiency and HbA1c levels in T2DM cases (p = 0.057) or control subjects (p = 0.675).
• Similarly, no significant association was observed between serum 25OHD deficiency and HOMA-IR in T2DM cases (p = 0.257) or control subjects (p = 0.647).

Conclusions:

• Vitamin D deficiency is highly prevalent in both type 2 diabetes mellitus patients and non-diabetic individuals in the studied population.
• The current study did not establish a clinically significant role for vitamin D (25OHD) in influencing hemoglobin glycation (HbA1c) or insulin resistance (HOMA-IR) among T2DM subjects.