If you’re constantly hungry, inflamed, and riding energy swings all day…
Fasting lowers insulin and reduces inflammation. It restores metabolic flexibility so you can switch between sugar and fat for fuel without crashing.
Around 12–16 hours, you begin shifting into cellular repair. Past 24 hours, fat burning climbs. Closer to 72 hours, deeper cleanup processes and immune recalibration become more pronounced.
Growth hormone rises to help protect lean mass while you mobilize stored fat. Neuroinflammation drops. BDNF increases. Mental clarity improves.
Gary Brecka explains the benefits of fasting.