Time-restricted feeding improves adaptation to chronically alternating light-dark cycles

Area of Science:

• Chronobiology
• Metabolic Health
• Circadian Rhythms

Background:

• Circadian clock disruption is linked to cardio-metabolic disorders.
• Optimal food intake timing can improve metabolic health.
• Time-restricted feeding may mitigate adverse effects of shift work and jetlag.

Purpose of the Study:

• To investigate if time-restricted feeding minimizes long-term metabolic health effects of circadian clock disturbance.
• To assess the impact of different feeding schedules on adaptation to altered light-dark cycles.

Main Methods:

• Female FVB mice were exposed to weekly alternating light-dark cycles (12-hour shifts).
• Feeding strategies included ad libitum, dark phase feeding, and fixed clock time feeding (during the original dark phase).
• Metabolic parameters and core body temperature rhythms were monitored.

Main Results:

• Long-term circadian disruption had modest effects on metabolic parameters.
• Fixed time feeding delayed adaptation to light phase feeding, increasing triglyceride levels and decreasing energy expenditure.
• Dark phase feeding accelerated rhythm adaptation but did not improve metabolic state compared to ad libitum feeding.

Conclusions:

• Restricting food intake to the active dark phase enhances adaptation to shifted light-dark schedules.
• This feeding strategy did not significantly impact overall metabolic parameters in this model.
• Circadian rhythm adaptation and metabolic health may be dissociable under certain feeding conditions.