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Red meat, dairy, and insulin sensitivity: a randomized crossover intervention study.

Kirsty M Turner¹, Jennifer B Keogh¹, Peter M Clifton²

¹From the School of Pharmacy and Medical Sciences, University of South Australia, Adelaide, Australia.

The American Journal of Clinical Nutrition

|March 27, 2015

Summary

High dairy intake reduced insulin sensitivity in overweight adults, contrary to some observational studies. A lean red meat diet improved insulin sensitivity compared to a high-dairy diet in women.

Keywords:

dairy dietary proteins insulin sensitivity red meat type 2 diabetes

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Area of Science:

Metabolic Health
Nutritional Science
Endocrinology

Background:

Epidemiologic studies suggest red meat increases type 2 diabetes risk, while dairy may decrease it.
Intervention studies investigating these dietary links are limited.

Purpose of the Study:

To compare the effects of high lean red meat, high low-fat dairy, and control diets on insulin sensitivity.
To assess dietary impacts in overweight and obese individuals, including those with glucose intolerance.

Main Methods:

A randomized crossover study involving 47 overweight/obese men and women.
Three 4-week weight-stable dietary interventions: high lean red meat, high dairy, and control.
Oral glucose tolerance tests measuring glucose, insulin, and C-peptide.

Main Results:

High dairy consumption decreased insulin sensitivity (HOMA-IR) compared to the red meat diet.
Women showed significantly lower insulin sensitivity after the dairy diet versus the red meat diet.
No significant differences in insulin sensitivity were observed between diets in men.

Conclusions:

Contrary to some observational data, high dairy intake may reduce insulin sensitivity compared to lean red meat in overweight/obese individuals.
Dietary interventions reveal complex relationships between meat, dairy, and metabolic health.
Findings highlight potential sex-specific differences in dietary impacts on insulin sensitivity.