Time-restricted feeding regulates circadian clock genes, profoundly influencing metabolic health, liver function, and systemic inflammation. Optimal protocols involve avoiding food for at least one hour after waking and two to three hours before bedtime to maximize the restorative benefits of sleep-related fasting. An eight-hour feeding window serves as a sustainable, evidence-based target; shorter windows frequently trigger compensatory overeating, while inconsistent schedules disrupt circadian entrainment, effectively inducing metabolic "jet lag." Biological mechanisms like mTOR, which governs cell growth, and AMPK, which drives cellular repair and autophagy, are modulated by these feeding states. Practical implementation requires consistent scheduling, strategic light exposure for circadian alignment, and electrolyte management—specifically salt intake—to maintain cognitive clarity and physical stability during fasting periods. These strategies leverage biological mechanisms to enhance weight management, organ health, and overall longevity without requiring strict caloric counting.
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