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Body fat accretion: a rat model.

P A Scotellaro1, L L Ji, J Gorski

  • 1Department of Physical Education, University of Illinois, Chicago 60680.

Medicine and Science in Sports and Exercise
|March 1, 1991
PubMed
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This study developed a rat model to investigate body fat accretion. Fat rats exhibited greater lean body mass and caloric intake, suggesting these factors contribute to adiposity, not just energy expenditure differences.

Area of Science:

  • Physiology
  • Metabolism
  • Animal Models

Background:

  • Understanding the causes of body fat accretion is crucial for addressing obesity.
  • Previous research has explored various factors contributing to adiposity, including energy intake, expenditure, and metabolic regulation.

Purpose of the Study:

  • To develop and utilize a rat model to investigate the primary determinants of body fat accretion.
  • To differentiate between energy intake and expenditure as causes of increased adiposity.

Main Methods:

  • A rat model was established by selecting the seven fattest and seven leanest rats from a group of 100 to create distinct fat and lean groups.
  • Measurements included carcass fat content, energy excretion in feces and urine, brown adipose tissue thermogenesis, hepatic lipogenic enzyme activity, and lean body mass.

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Main Results:

  • A significant difference in carcass fat content (108 g) was achieved between the selected fat and lean rat groups.
  • Energy excretion was directly proportional to caloric intake, indicating no significant caloric wastage in the gastrointestinal tract.
  • Differences in brown adipose tissue thermogenesis did not explain the adiposity disparity.
  • Hepatic lipogenic enzymes were not upregulated in fat rats despite higher carbohydrate intake; fat rats also had greater lean body mass.

Conclusions:

  • Caloric intake and lean body mass appear to be significant contributors to increased adiposity.
  • The experimental selection process itself is a critical factor to consider when analyzing the relationship between caloric intake and body fat.
  • This model provides valuable insights into the multifactorial nature of body fat accretion.