Protein & Autophagy Longevity Calculator
Calibrate your clinical daily protein threshold to protect lean muscle mass and prevent sarcopenia while strategically cycling fasting windows to trigger cellular autophagy.
109 – 136 grams / day
1.6 - 2 g/kg | Calibrate your clinical daily protein threshold to protect lean muscle mass and prevent sarcopenia while strategically cycling fasting windows to trigger cellular autophagy.
30–45g/meal (2.5–3g leucine trigger)
The 24-Hour Cellular Autophagy Timeline
Elevated insulin and amino acid influx stimulate mTOR. Cellular autophagy is suppressed while nutrients are partitioned.
Insulin declines toward baseline. Liver shifts to gluconeogenesis and hepatic glycogen stores are steadily mobilized.
AMPK activation inhibits mTOR. Cells begin engulfing damaged organelles and recycling senescent components via autophagosomes.
Maximal lysosomal degradation of dysfunctional mitochondria (mitophagy), reducing cellular senescence and systemic inflammation.
The Leucine Threshold (3.0g)
Each meal must supply at least 2.5–3.0g of leucine to activate sestrin2 and trigger Muscle Protein Synthesis via mTORC1.
Track Fuel & Fasting in Habitspan Protocol
Log your daily metabolic and cellular recovery habits in 15 seconds to compound long-term vitality.
The Protein-Autophagy Paradox Explained
For decades, gerontology debated whether to restrict protein to promote autophagy via mTOR inhibition, or to increase protein to preserve skeletal muscle and bone density. Modern Medicine 3.0 clinical practice demonstrates that muscle mass and cardiorespiratory fitness are the two strongest predictors of all-cause mortality reduction.
🥩 The Leucine Threshold (3.0g)
Each meal must supply at least 2.5–3.0g of leucine to activate sestrin2 and trigger Muscle Protein Synthesis via mTORC1.
🧬 Pulsing vs Chronic Suppression
Longevity is maximized by pulsing mTOR through nutrient-dense meals separated by digestive fasts, rather than chronic low-grade consumption.
Key Physiological Benchmarks
- Frontload 30–40g of protein in the first meal to overcome overnight anabolic resistance
- Target 1.6–2.0 g/kg body weight daily for active adults and centenarian preparation
- Maintain an overnight digestive fast of 12–16 hours to allow hepatic glycogen depletion and lysosomal recycling
- Cease all caloric intake 3 hours prior to sleep to prevent circadian disruption and nighttime insulin spikes
Does eating protein completely stop autophagy?
Protein consumption elevates systemic amino acid levels (particularly leucine and arginine), activating mTOR and temporarily suppressing autophagy. However, this anabolic stimulus is essential to build and preserve lean muscle. Strategic fasting windows allow you to alternate between muscle preservation and cellular recycling.
How many meals should I split my daily protein across?
Clinical evidence shows that spreading protein across 3 distinct meals (each containing 30–45g) optimally triggers the leucine threshold and maximizes 24-hour muscle protein synthesis, compared to continuous grazing.
Is 16 hours of fasting necessary to get autophagy benefits?
Basal autophagy occurs continuously at low levels. Mild autophagy accelerates around 12–14 hours of fasting as liver glycogen depletes, with deeper mitophagy peaking around 16–24 hours. A consistent 14–16 hour overnight window is highly sustainable and clinically effective.