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Imbalanced protein and appetite.

R C de Angelis, N Takahashi, L A Amaral

    Arquivos De Gastroenterologia
    |October 1, 1978
    PubMed
    Summary
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    Dietary protein imbalance in rats affects appetite and body development. An increased nonessential to essential amino acid ratio in the diet correlated with decreased body development, appetite, and plasma albumin levels.

    Area of Science:

    • Nutritional Biochemistry
    • Animal Nutrition
    • Physiology

    Background:

    • Dietary protein quality significantly impacts animal health and metabolism.
    • Understanding amino acid profiles is crucial for optimizing nutrition.
    • Previous research indicates protein-energy balance affects physiological responses.

    Purpose of the Study:

    • To investigate the impact of different protein sources on rat plasma amino acid profiles.
    • To determine the relationship between dietary amino acid imbalance and physiological parameters like appetite and body development.
    • To assess whether plasma amino acid composition reflects dietary protein composition.

    Main Methods:

    • Rats were fed diets with varying protein sources (casein, common corn, opaque-2 corn, egg albumin, gelatin) at 7 g protein/100 g.

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  • A protein-free diet was used as a control.
  • Plasma free amino acid concentrations were analyzed.
  • Body development and voluntary food intake were monitored.

    • Main Results:

    • Dietary protein imbalance, specifically an increased nonessential to essential (NE/E) amino acid ratio, negatively affected body development and appetite.
    • A significant inverse correlation was observed between the NE/E ratio of plasma free amino acids and voluntary food intake.
    • Plasma amino acid profiles did not accurately mirror the amino acid composition of the consumed diets.

    Conclusions:

    • The NE/E amino acid ratio is a critical factor influencing appetite and body development in rats.
    • Plasma aminograms are not reliable indicators of dietary protein composition.
    • Nutritional strategies should focus on balancing essential and nonessential amino acids for optimal animal growth and health.