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During the initial hours of fasting, the body uses up its glycogen stores as an energy source. Once these glycogen reserves are depleted, the body begins breaking down stored triglycerides and structural proteins. During this stage, glycerol becomes a key substrate for gluconeogenesis, while free fatty acids undergo beta-oxidation to provide energy for tissues, such as skeletal muscle. In the fasting state, the body spares protein breakdown as much as possible to conserve muscle and structural...
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The postabsorptive state usually starts about four hours after a meal and lasts until the next meal is eaten. During this time, the digestive system stops absorbing nutrients, and the body uses stored energy reserves to maintain stable blood glucose levels.
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Eight days of water-only fasting and exercise improved body satisfaction and composition in middle-aged men. While physical changes positively impacted self-perceived health, core body image remained unchanged.

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Area of Science:

  • Physiology
  • Psychology
  • Nutrition Science

Background:

  • Fasting and physical exertion are known to influence body mass and composition.
  • Understanding these effects on psychological parameters like body image is crucial.

Purpose of the Study:

  • To investigate the impact of an 8-day water-only fasting intervention combined with physical exertion on body satisfaction and body image in middle-aged men.
  • To assess changes in physical and psychological parameters before and after the intervention.

Main Methods:

  • Fifteen middle-aged men underwent an 8-day water-only fasting period.
  • Physical (body mass, composition) and psychological (body satisfaction, body image) assessments were conducted pre- and post-fasting, at rest and post-exercise.
  • Correlation and concordance analyses were performed.

Main Results:

  • Fasting reduced body mass and improved body composition, leading to increased body satisfaction and self-rated health.
  • Body image parameters and attitudes toward weight control methods remained stable.
  • Positive correlations were found between satisfaction with body parts and overall positive body image.

Conclusions:

  • Water-only fasting and physical exertion positively influence body satisfaction and its components in middle-aged men.
  • These interventions do not significantly alter fundamental body image parameters.
  • Participants preferred dietary changes over pathological weight control methods.