¶ Fasting and Time-Restricted Feeding
Harnessing evolutionary biology for metabolic flexibility and cellular rejuvenation.
¶ At a Glance
What is it?
Fasting is the voluntary abstinence from food (and sometimes drink) for a specific period. Unlike starvation, which is involuntary and harmful, fasting is a controlled stressor (hormesis) that triggers ancient survival mechanisms. The most common modern iteration is Time-Restricted Feeding (TRF), where eating is confined to a specific window (e.g., 8 hours) each day.
Why do it?
Beyond weight loss, fasting is a potent trigger for autophagy (cellular cleanup), improved insulin sensitivity, and metabolic flexibility (switching fuel from glucose to fat). It is one of the few interventions consistently linked to lifespan extension in animal models.
Key Takeaway
Fasting is not just about "not eating"—it is a metabolic reset. While 16:8 is a great entry point for daily maintenance, deeper benefits like significant autophagy and immune system rebooting typically require longer durations (24h+). It is not suitable for everyone, particularly those with a history of eating disorders, pregnant women, or Type 1 diabetics.
¶ The "Why": Benefits & Health Outcomes
¶ 1. Metabolic Flexibility & Insulin Sensitivity
The modern "Standard American Diet" keeps insulin levels perpetually elevated, locking the body in fat-storage mode. Fasting lowers insulin, allowing the body to access stored body fat for energy. This "Metabolic Switch" from glucose to ketones is the cornerstone of fasting's benefits.