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System-wide Benefits of Intermeal Fasting by Autophagy.

Cell metabolism | 2017

Autophagy failure is associated with metabolic insufficiency. Although caloric restriction (CR) extends healthspan, its adherence in humans is poor. We established an isocaloric twice-a-day (ITAD) feeding model wherein ITAD-fed mice consume the same food amount as ad libitum controls but at two short windows early and late in the diurnal cycle. We hypothesized that ITAD feeding will provide two intervals of intermeal fasting per circadian period and induce autophagy. We show that ITAD feeding modifies circadian autophagy and glucose/lipid metabolism that correlate with feeding-driven changes in circulating insulin. ITAD feeding decreases adiposity and, unlike CR, enhances muscle mass. ITAD feeding drives energy expenditure, lowers lipid levels, suppresses gluconeogenesis, and prevents age/obesity-associated metabolic defects. Using liver-, adipose-, myogenic-, and proopiomelanocortin neuron-specific autophagy-null mice, we mapped the contribution of tissue-specific autophagy to system-wide benefits of ITAD feeding. Our studies suggest that consuming two meals a day without CR could prevent the metabolic syndrome.

Pubmed ID: 29107505 RIS Download

Associated grants

  • Agency: NIDDK NIH HHS, United States
    Id: R01 DK105441
  • Agency: NIDDK NIH HHS, United States
    Id: P30 DK041296
  • Agency: NIA NIH HHS, United States
    Id: T32 AG023475
  • Agency: NIDDK NIH HHS, United States
    Id: R01 DK033823
  • Agency: NIA NIH HHS, United States
    Id: R01 AG043517
  • Agency: NIA NIH HHS, United States
    Id: R37 AG018381
  • Agency: NIDDK NIH HHS, United States
    Id: P30 DK020541
  • Agency: NIA NIH HHS, United States
    Id: P30 AG038072
  • Agency: NIDDK NIH HHS, United States
    Id: P30 DK026687
  • Agency: NIA NIH HHS, United States
    Id: RF1 AG043517
  • Agency: NIA NIH HHS, United States
    Id: P01 AG031782

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