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Background  Plasma total homocysteine (tHcy) is commonly elevated in persons with diabetes. This may be due to effects of insulin and/or glucose and/or metabolic control on the metabolism or plasma levels of tHcy. This study examined the effects of fasting plasma glucose status on fasting tHcy levels among adults without diabetes, and diabetes  per se  among adults with a self-report history of diabetes.    Methods  Analysis of data on adults (≥ 20y) who had fasted at least 8 hours, from the National Health and Nutrition Examination Survey (1999–2000 and 2001–2002). Subjects with no self-report history of diabetes were grouped according to fasting plasma glucose status as normal (< 100 mg/dL = NFG,  n  = 2,244), impaired (≥ 100 < 126 mg/dL = IFG,  n  = 1,108), or a provisional diagnosis of diabetes (≥ 126 mg/dL = DFG,  n  = 133). Subjects with a self-report history of diabetes ( n  = 275) were examined separately.    Results  Fasting tHcy was higher ( Ps  < 0.01) among non-diabetic subjects with DFG and IFG, compared to NFG (median [95% confidence interval] = 8.6 [8.0–9.2], 8.3 [8.1–8.5], and 7.4 [7.3–7.5] μmol/L, respectively). Diabetic subjects had levels similar to non-diabetic subjects with DFG and IFG (8.3 [7.9–8.6] μmol/L). Age and estimated creatinine clearance were strong correlates of fasting tHcy among non-diabetic subjects ( r  = 0.38 to 0.44 and  r  = -0.35 to -0.46, respectively) and diabetic subjects ( r  = 0.41 and  r  = -0.46, respectively) ( Ps  < 0.001), while fasting glucose and glycohemoglobin (HbA 1c ) were weaker (but still significant) correlates of tHcy in non-diabetic and diabetic subjects. Fasting glucose status was not a significant independent predictor of fasting tHcy levels in non-diabetic subjects, and HbA 1c  was not a significant independent predictor of tHcy in diabetic subjects ( Ps  > 0.05).    Conclusion  Fasting tHcy levels are elevated among non-diabetic adults with elevated fasting glucose levels, compared to persons with normal fasting glucose levels, and among diabetic adults. However, elevations in fasting tHcy appear to be mediated primarily by age and kidney function, and not by measures of glucose metabolism.

nutrition and metabolism

Age and kidney function are the primary correlates of fasting plasma total homocysteine levels in non-diabetic and diabetic adults. Results from the 1999-2002 National Health and Nutrition Examination Survey.