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Related Experiment Videos

Peripheral insulin sensitivity as modified by diet and exercise training.

G K Grimditch1, R J Barnard, L Hendricks

  • 1Kinesiology Department, University of California, Los Angeles 90024.

The American Journal of Clinical Nutrition
|July 1, 1988
PubMed
Summary
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Response of immature bone-ligament junction to a high-fat-sucrose diet.

Clinical biomechanics (Bristol, Avon)·2013

High-fat sucrose diets cause insulin resistance in rats, driven by sucrose or lack of complex carbohydrates, not fat. Exercise and fiber did not prevent this diet-induced insulin resistance.

Area of Science:

  • Nutrition Science
  • Metabolic Research
  • Animal Models

Background:

  • Insulin resistance is a metabolic dysfunction linked to diet.
  • The specific dietary components causing insulin resistance in high-fat diets are not fully understood.
  • Investigating the roles of fat, sucrose, and complex carbohydrates is crucial.

Purpose of the Study:

  • To identify the dietary component responsible for insulin resistance in high-fat sucrose diets.
  • To evaluate the efficacy of exercise training and dietary fiber in preventing diet-induced insulin resistance.
  • To compare the effects of different dietary compositions on glucose and insulin regulation.

Main Methods:

  • Six dietary groups of rats were established: low-fat complex carbohydrate (LFCC), high-fat complex carbohydrate (HFCC), low-fat sucrose (LFS), high-fat sucrose (HFS), HFS with fiber (HFS + F), and HFS with exercise (HFS + EX).

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  • Diets were administered for 10 weeks.
  • Intravenous glucose tolerance tests were performed to assess glucose intolerance and insulin resistance.

    • Main Results:

    • High-fat sucrose (HFS) and HFS + Fiber (HFS + F) groups exhibited glucose intolerance.
    • Insulin resistance was observed in the LFS, HFS, HFS + F, and HFS + EX groups.
    • High fat content was not the cause of insulin resistance; rather, the presence of sucrose or the absence of complex carbohydrates was implicated.
    • Dietary fiber supplementation and exercise training did not ameliorate the insulin resistance.

    Conclusions:

    • Sucrose, or the lack of complex carbohydrates, is the primary driver of insulin resistance in the context of high-fat diets.
    • Dietary interventions like fiber supplementation and exercise training are ineffective in preventing sucrose-induced insulin resistance in this model.
    • These findings highlight the importance of carbohydrate source over fat content in metabolic health.