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Diet Composition Differentially Affects Insulin Pathway Compromised and Control Flies.

Deyannira Otero-Moreno1, Juan Manuel Murillo-Maldonado1, Juan R Riesgo-Escovar1

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Higher protein diets improve survival in fruit flies, even those with insulin pathway defects mimicking diabetes. Methionine supplementation aids survival, particularly in less protein-rich diets.

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Area of Science:

  • Evolutionary biology
  • Metabolic pathways
  • Nutritional science

Background:

  • The insulin pathway regulates glucose homeostasis and is conserved across species.
  • Disruptions in the insulin pathway can lead to diabetic states, a prevalent global health issue.
  • Long-term evolutionary studies of diabetic states are limited.

Purpose of the Study:

  • To investigate the long-term effects of different diets on insulin pathway signaling compromised flies (akin to type II diabetes) and wild-type controls.
  • To assess the impact of dietary protein, lipid, carbohydrate, and methionine content on fly survival and life history.
  • To explore differences in dietary responses between healthy and "diabetic" fly models.

Main Methods:

  • Cultured three insulin pathway mutant fly strains and wild-type controls for one generation.
  • Fed flies isocaloric diets with varying macronutrient compositions (protein, lipid, carbohydrate) and added methionine.
  • Measured adult fly weight, total lipid and carbohydrate content, and adult survival rates.

Main Results:

  • All diets supported survival to adulthood, but life histories differed significantly.
  • Higher protein diets promoted better survival than higher lipid or carbohydrate diets.
  • Added methionine improved survival in moderately protein-reduced diets and had a modest effect in mutants.

Conclusions:

  • Dietary protein content significantly impacts survival, with higher protein levels being beneficial.
  • Methionine supplementation can enhance survival, especially in diets with suboptimal protein levels.
  • Insulin pathway compromised flies exhibit reduced survival, and their response to methionine differs from wild-type flies, highlighting distinct "healthy" versus "diabetic" states.