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Original Research

Minimal Contribution of Fasting Hyperglycemia to the Incidence of Type 2 Diabetes in Subjects With Normal 2-h Plasma Glucose

  1. Muhammad A. Abdul-Ghani, MD, PHD1,
  2. Michael P. Stern, MD2,
  3. Valeriya Lyssenko, MD, PHD3,
  4. Tiinamaija Tuomi, MD, PHD3,
  5. Leif Groop, MD3 and
  6. Ralph A. DeFronzo, MD3
  1. 1Division of Diabetes, University of Texas Health Science Center at San Antonio, San Antonio, Texas;
  2. 2Division of Clinical Epidemiology, University of Texas Health Science Center at San Antonio, San Antonio, Texas;
  3. 3Department of Clinical Sciences, Diabetes and Endocrinology and Lund University Diabetes Center, Lund University, Malmö, Sweden.
  1. Corresponding author: Muhammad A. Abdul-Ghani, abdulghani{at}uthscsa.edu.
Diabetes Care 2010 Mar; 33(3): 557-561. https://doi.org/10.2337/dc09-1145
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Abstract

OBJECTIVE To assess the relative contribution of increased fasting and postload plasma glucose concentrations to the incidence of type 2 diabetes in subjects with a normal 2-h plasma glucose concentration.

RESEARCH DESIGN AND METHODS A total of 3,450 subjects with 2-h plasma glucose concentration <140 mg/dl at baseline were followed up in the San Antonio Heart Study (SAHS) and the Botnia Study for 7–8 years. The incidence of type 2 diabetes at follow-up was related to the fasting, 1-h, and 2-h plasma glucose concentrations.

RESULTS In subjects with 2-h plasma glucose <140 mg/dl, the incidence of type 2 diabetes increased with increasing fasting plasma glucose (FPG) and 1-h and 2-h plasma glucose concentrations. In a multivariate logistic analysis, after adjustment for all diabetes risk factors, the FPG concentration was a strong predictor of type 2 diabetes in both the SAHS and the Botnia Study (P < 0.0001). However, when the 1-h plasma glucose, but not 2-h plasma glucose, concentration was added to the model, FPG concentration was no longer a significant predictor of type 2 diabetes in both studies (NS). When subjects were matched for the level of 1-h plasma glucose concentration, the incidence of type 2 diabetes markedly increased with the increase in 1-h plasma glucose, but the increase in FPG was not associated with a significant increase in the incidence of type 2 diabetes.

CONCLUSIONS An increase in postload glycemia in the normal range is associated with an increase in the incidence of type 2 diabetes. After controlling for 1-h plasma glucose concentration, the increase in FPG concentration is not associated with an increase in the incidence of type 2 diabetes.

Footnotes

  • The costs of publication of this article were defrayed in part by the payment of page charges. This article must therefore be hereby marked “advertisement” in accordance with 18 U.S.C. Section 1734 solely to indicate this fact.

    • Received June 24, 2009.
    • Accepted November 20, 2009.
  • © 2010 by the American Diabetes Association.
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Diabetes Care: 33 (3)

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Minimal Contribution of Fasting Hyperglycemia to the Incidence of Type 2 Diabetes in Subjects With Normal 2-h Plasma Glucose
Muhammad A. Abdul-Ghani, Michael P. Stern, Valeriya Lyssenko, Tiinamaija Tuomi, Leif Groop, Ralph A. DeFronzo
Diabetes Care Mar 2010, 33 (3) 557-561; DOI: 10.2337/dc09-1145

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Minimal Contribution of Fasting Hyperglycemia to the Incidence of Type 2 Diabetes in Subjects With Normal 2-h Plasma Glucose
Muhammad A. Abdul-Ghani, Michael P. Stern, Valeriya Lyssenko, Tiinamaija Tuomi, Leif Groop, Ralph A. DeFronzo
Diabetes Care Mar 2010, 33 (3) 557-561; DOI: 10.2337/dc09-1145
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