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Diet and gastric digestion.

A Dubois

    The American Journal of Clinical Nutrition
    |November 1, 1985
    PubMed
    Summary

    Gastric digestion involves stomach food storage, grinding, and delivery in three phases. Psychological factors, food sensory cues, meal composition, and starvation influence these digestive processes via neural and hormonal pathways.

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    Area of Science:

    • Physiology
    • Gastroenterology

    Background:

    • Gastric digestion is crucial for nutrient absorption, involving food storage, mechanical breakdown, and controlled emptying.
    • Understanding the regulation of gastric digestion is key to addressing digestive disorders.

    Purpose of the Study:

    • To outline the three phases of gastric digestion: adaptive relaxation, solid liquefaction, and liquefied solid emptying.
    • To explore the multifactorial influences on gastric digestion, including sensory, compositional, and psychological factors.
    • To identify the neural and hormonal mediators of gastric digestive regulation.

    Main Methods:

    • Review of physiological mechanisms governing gastric function.
    • Analysis of factors affecting gastric motility and emptying.
    • Examination of the role of the nervous system and hormones in digestion.

    Main Results:

    • Gastric digestion comprises adaptive relaxation, liquefaction of solids, and emptying of liquefied contents.
    • Psychological factors, sensory food properties (sight, smell, taste), and meal characteristics (volume, composition) significantly impact digestion.
    • Starvation is also suggested to influence gastric processes.
    • Parasympathetic and sympathetic nerves, along with enteric and extradigestive hormones, mediate these effects.

    Conclusions:

    • Gastric digestion is a complex, regulated process influenced by a wide array of internal and external stimuli.
    • The interplay between the central nervous system, enteric nervous system, and hormonal signals orchestrates gastric function.
    • Further research into these regulatory pathways could offer insights into managing gastrointestinal conditions.

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