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Meal composition and its effect on postprandial sleepiness

W C Orr1, G Shadid, M J Harnish

  • 1Thomas N. Lynn Institute for Healthcare Research, Integris-Baptist Medical Center, Oklahoma City, OK 73112, USA.

Physiology & Behavior
|October 1, 1997
PubMed
Summary

Solid meals, unlike liquid meals, significantly reduce sleep onset latency after eating. Meal composition (fat, carbohydrate) did not affect post-meal drowsiness or sleepiness.

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Area of Science:

  • Nutrition Science
  • Sleep Medicine
  • Human Physiology

Background:

  • Postprandial somnolence, or sleepiness after eating, is a common human experience.
  • The specific impact of meal consistency (solid vs. liquid) and macronutrient composition on sleepiness remains incompletely understood.

Purpose of the Study:

  • To investigate the effects of solid versus liquid meals on objective postprandial sleep latencies.
  • To examine how meal constituents (high-fat, high-carbohydrate, mixed) influence sleep onset latency after food ingestion.

Main Methods:

  • Two experiments involving ten healthy male subjects each.
  • Standard polysomnography was used to measure sleep onset latency during scheduled naps.
  • Subjects consumed either a solid meal, a liquid meal, or water (control) and underwent postprandial nap recordings.

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Main Results:

  • Solid meals significantly decreased postprandial sleep onset latency compared to an equivalent volume of water.
  • No significant differences in sleep latency were observed between liquid meals and water.
  • Meal constituents (high-fat, high-carbohydrate, mixed) did not significantly affect postprandial sleep latencies.

Conclusions:

  • Solid food intake, in contrast to liquid intake, promotes reduced sleep onset latency.
  • The macronutrient composition of a meal does not appear to influence postprandial sleepiness.