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Short Reports

Nondiabetic Mexican-Americans Do Not Have Reduced Insulin Responses Relative to Nondiabetic Non-Hispanic Whites

  1. Steven M Haffner, MD,
  2. Heikki Miettinen, MD and
  3. Michael P Stern, MD
  1. Division of Clinical Epidemiology, Department of Medicine, University of Texas Health Science Center at San Antonio San Antonio, Texas
  1. Address correspondence and reprint requests to Steven M. Haffner, MD, The University of Texas Health Science Center at San Antonio, Division of Clinical Epidemiology, Department of Medicine, 7703 Floyd Curl Dr., San Antonio, TX, 78284-7873
Diabetes Care 1996 Jan; 19(1): 67-69. https://doi.org/10.2337/diacare.19.1.67
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Abstract

OBJECTIVE To study why Mexican-Americans have a threefold increase in NIDDM relative to non-Hispanic whites. The etiology of NIDDM is still controversial, with both insulin resistance and decreased insulin secretion proposed as precursors of NIDDM.

RESEARCH DESIGN AND METHODS We examined possible ethnic differences in fasting insulin (as a marker of insulin resistance) and change in insulin-to-change in glucose ratio (ΔI30:ΔG30) during the first 30 min after oral glucose ingestion (as a marker of abnormal whites from the San AntonioHeart Study, a population-based study of diabetes and cardiovascular disease. Fasting insulin and ΔI30:ΔG30 were evaluated as continuous variables.

RESULTS Mexican-Americans had increased insulin concentrations at fasting and 30, 60, and 120 min after an oral glucose load as well as an increased 0- to 30-min increment in insulin and ΔI30:ΔG30 relative to non-Hispanic whites. These results remained unchanged after adjustment for age, sex, obesity, body fat distribution, and glucose tolerance.

CONCLUSIONS These results suggest that increased insulin resistance rather than decreased insulin secretion is characteristic of nondiabetic Mexican-Americans, a high-risk population for NIDDM.

  • Received April 14, 1995.
  • Revision received August 10, 1995.
  • Accepted August 10, 1995.
  • Copyright © 1996 by the American Diabetes Association

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January 1996, 19(1)
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Nondiabetic Mexican-Americans Do Not Have Reduced Insulin Responses Relative to Nondiabetic Non-Hispanic Whites
Steven M Haffner, Heikki Miettinen, Michael P Stern
Diabetes Care Jan 1996, 19 (1) 67-69; DOI: 10.2337/diacare.19.1.67

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Nondiabetic Mexican-Americans Do Not Have Reduced Insulin Responses Relative to Nondiabetic Non-Hispanic Whites
Steven M Haffner, Heikki Miettinen, Michael P Stern
Diabetes Care Jan 1996, 19 (1) 67-69; DOI: 10.2337/diacare.19.1.67
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