As we age, our muscles undergo significant changes. By age 60, we lose between 3% to 8% of our muscle mass every decade starting from age 30. Muscles are made up of two main types of fibers: slow-twitch type I fibers and fast-twitch type II fibers. Type II fibers, responsible for quick energy bursts, decline faster than the endurance-focused type I fibers as we age.

Aging also leads to increased inflammation, marked by higher levels of agents like IL-1β, IL-6, and TNF-α. This inflammation impacts mitochondria, leading to decreased energy production and increased reactive oxygen species (ROS), which further damage cells. Metabolic issues like insulin resistance and muscle degradation through the ubiquitin-proteasome system (UPS) are also prevalent.

A key factor in muscle shrinkage is anabolic resistance, where muscles respond less effectively to growth signals like amino acids. The mTOR pathway, crucial for muscle protein synthesis, becomes less responsive with age, leading to reduced protein synthesis even with adequate protein intake.

Mitochondrial numbers and function decline with age, and accumulated mutations in mitochondrial DNA contribute to cell death. Increased oxidative stress and ROS production create a damaging cycle that further impairs mitochondrial function.

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