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Assessing Insulin Sensitivity and Postprandial Triglyceridemic Response Phenotypes With a Mixed Macronutrient
John W Newman1,2,3, Sridevi Krishnan2, Kamil Borkowski3
1Western Human Nutrition Research Center, Agricultural Research Service, USDA, Davis, CA, United States.
Frontiers in Nutrition
|May 31, 2022
Summary
A novel mixed macronutrient tolerance test (MMTT) accurately assesses insulin sensitivity and postprandial triglyceridemia. This validated method offers a reliable tool for evaluating metabolic responses in healthy individuals.
Area of Science:
- Clinical Nutrition
- Metabolic Physiology
- Nutritional Phenotyping
Background:
- Meal challenge tests are established for assessing postprandial responses but lack standardized compositions.
- Variability in challenge meal protocols hinders consistent clinical nutrition research.
Purpose of the Study:
- To validate a mixed macronutrient tolerance test (MMTT) for simultaneous assessment of insulin sensitivity and postprandial triglyceridemia.
- To evaluate the MMTT's efficacy in clinically healthy subjects with diverse BMIs.
Main Methods:
- A mixed macronutrient tolerance test (MMTT) with defined composition was administered to two study populations.
- Insulin sensitivity was calculated using the Matsuda Index algorithm with MMTT data.
- Postprandial triglyceridemia was assessed via triglyceride excursion curves from serial blood draws.
Main Results:
- The MMTT-derived insulin sensitivity index (ISI_MMTT) strongly correlated with the oral glucose tolerance test (OGTT)-derived index (r=0.77, p<0.001).
- The MMTT identified mild-to-moderate triglyceridemia, revealing a higher prevalence than fasting indications.
- Specific triglyceride response patterns were stratified, with some individuals showing minimal or sustained triglyceride increase up to 6 hours.
Conclusions:
- The validated MMTT enables parallel determination of insulin sensitivity and postprandial triglyceridemia.
- This test provides a standardized, efficient method for metabolic phenotyping in research settings.
- The MMTT is suitable for assessing key metabolic parameters in individuals without diagnosed disease.
