277. Commusings: The Physical and Spiritual Dimensions of Fasting

Metabolism

Fasting significantly alters metabolic processes, shifting the body's energy source from glucose to fat. Jeff Krasno explains that during fasting, blood glucose levels drop, triggering the release of glucagon, which promotes gluconeogenesis and the breakdown of triglycerides into free fatty acids and glycerol for energy 1. This shift leads to ketosis, where ketones are used by brain cells, reducing free radicals and reactive oxygen species 1.

Instead of your mitochondria burning glucose for energy, it burns fat.

--- Jeff Krasno

Krasno also highlights the role of intermittent fasting combined with a ketogenic diet in managing blood glucose levels and preventing insulin resistance 2.

   

Cellular Health

Fasting initiates cellular cleanup processes like autophagy, crucial for maintaining cellular health and longevity. Krasno describes how fasting activates AMPK, which opposes mTOR, triggering autophagy to recycle damaged proteins into amino acids for new protein synthesis 3. This process is vital for longevity and also stimulates mitochondrial biogenesis, counteracting age-related declines in mitochondrial activity 3.

Fasting is a signal that activates a cellular pathway known as AMPK.

--- Jeff Krasno

Additionally, fasting impacts gut health by promoting beneficial bacterial strains and enhancing insulin sensitivity 3.

   

DNA & Longevity

Fasting influences DNA expression through epigenetic mechanisms, impacting longevity. Krasno explains that fasting activates sirtuins, proteins that regulate DNA expression and mitochondrial function, and suppress tumor growth 4. This activation is akin to a virtuoso pianist playing the piano keys of DNA, enhancing genomic expression 4.

Fasting improves metabolic function and addresses many of the hallmarks of aging.

--- Jeff Krasno

Moreover, fasting increases antioxidant production, reducing oxidative stress and supporting longevity 4.