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Perspectives: do alcohol calories count?

C S Lieber1

  • 1Section of Liver Diseases, Bronx Veterans Affairs Medical Center, NY 10468.

The American Journal of Clinical Nutrition
|December 1, 1991
PubMed
Summary
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Chronic alcohol consumption does not lead to expected weight gain. Ethanol intake causes weight loss, suggesting altered fat energy utilization, potentially impacting mitochondrial function.

Area of Science:

  • Nutritional Science
  • Metabolic Research
  • Alcohol Metabolism

Background:

  • Chronic alcohol consumption paradoxically does not correlate with expected body weight changes.
  • Ethanol intake, even isocaloric to carbohydrates, results in weight loss, not gain.

Purpose of the Study:

  • To investigate the energy balance and metabolic effects of chronic alcohol consumption.
  • To elucidate the mechanisms behind the lack of expected weight gain despite ethanol intake.

Main Methods:

  • Review of existing literature on alcohol's metabolic effects.
  • Analysis of energy balance studies involving ethanol substitution and addition to diets.
  • Evaluation of hypotheses including metabolic pathway induction, sympathetic nervous system activation, and ATP breakdown.

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Main Results:

  • Isocaloric substitution of carbohydrates with ethanol leads to weight loss.
  • Ethanol addition to normal diets does not cause expected weight gain.
  • Existing hypotheses (microsomal ethanol oxidizing system, thermogenesis, purine catabolism) do not fully explain the energy deficit, especially with low-fat diets.

Conclusions:

  • Altered energy utilization from fat metabolism is a significant factor in the energy deficit associated with chronic alcohol consumption.
  • Mitochondrial dysfunction, potentially through uncoupling of oxidation and phosphorylation, may play a key role, particularly in the context of low-fat diets.