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Obesity01:24

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The Body Mass Index (BMI) is a numerical value derived from a person's weight and height, used to categorize individuals into weight ranges. It is calculated using the formula: weight in kilograms divided by height in meters squared. Obesity is a health condition characterized by excessive accumulation of adipose tissue that poses health risks, often diagnosed with a BMI ≥ 30. This excess fat storage occurs when surplus dietary calories are converted into triglycerides and stored in adipocytes...
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Updated: Jun 17, 2026

Assessing Activity-based Anorexia in Mice
08:26

Assessing Activity-based Anorexia in Mice

Published on: May 14, 2018

A rapidly occurring compensatory decrease in physical activity counteracts diet-induced weight loss in female

Elinor L Sullivan1, Judy L Cameron

  • 1Departmenet of Psychiatry, University of Pittsburgh, Pittsburgh, PA 15213, USA.

American Journal of Physiology. Regulatory, Integrative and Comparative Physiology
|January 15, 2010
PubMed
Summary
This summary is machine-generated.

Dieting significantly reduces physical activity, which is the body's primary defense against weight loss. Regular exercise can prevent this compensatory decrease in energy expenditure, aiding weight management.

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A Chronic High-Intensity Interval Training and Diet-Induced Obesity Model to Maximize Exercise Effort and Induce Physiologic Changes in Rats
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Published on: April 28, 2023

Area of Science:

  • Physiology
  • Metabolism
  • Obesity Research

Background:

  • Energy balance is crucial for weight management.
  • Dieting often leads to compensatory changes in energy expenditure.
  • Understanding these changes is key to effective weight loss strategies.

Purpose of the Study:

  • To investigate the impact of caloric restriction on energy balance and physical activity in ovariectomized female monkeys.
  • To determine the role of decreased physical activity in defending against diet-induced weight loss.
  • To assess the efficacy of exercise in counteracting compensatory energy expenditure during dieting.

Main Methods:

  • 18 ovariectomized female monkeys were subjected to a 30% and then 60% caloric deficit over two months.
  • Physical activity was monitored using accelerometry.
  • Metabolic rate was measured, and energy expenditure from exercise was calculated in a separate group.

Main Results:

  • A 30% caloric deficit led to a significant decrease in physical activity without significant weight loss.
  • A 60% caloric deficit resulted in weight loss and further activity suppression.
  • Decreased physical activity accounted for a substantial portion of the reduced metabolic rate.

Conclusions:

  • Diet-induced reduction in physical activity is a primary mechanism for defending against weight loss.
  • Exercise interventions can prevent compensatory decreases in energy expenditure, supporting weight loss efforts.
  • Maintaining physical activity levels is essential for successful weight management during caloric restriction.