This Fasting Method Repairs Joints, Cartilage, and Aging Skin

Contrary to popular belief that fasting breaks down muscle or slows metabolism, comprehensive studies on over 3,000 proteins during a multi-day fast show otherwise, especially concerning connective tissue. After 36 hours without food, significant changes in signaling and protein structures within the extracellular matrix (ECM) occur, affecting collagen turnover. Fasting can signal intrinsic biological processes to enhance repair mechanisms.

A Nature Metabolism study involving a 7-day fast revealed that muscle preservation kicks in after 48-72 hours. Nitrogen excretion, an indicator of muscle protein breakdown, was minimal even after a 7-day fast, suggesting that occasional longer-term fasting does not significantly deplete muscle mass. Shorter fasts might be slightly more catabolic but are generally not a concern unless fasting becomes a chronic habit combined with under-eating.

Fasting leads to changes in ECM and structural/collagen turnover, potentially rivaling stem cell benefits for connective tissue and soft tissue repair. There are significant increases in proteins associated with wound healing. This occurs because the body enters survival mode, reallocating resources for tissue repair and using the time to heal intrinsically rather than expending energy on digestion. This process is partly a response to the metabolic stress hormone FGF21, released after 48 hours of fasting, which also accelerates fat utilization.

Beyond the fasting period, studies show changes in the immune system, including a reset of chemokines (which target pathogens) and a reduction in pro-inflammatory cytokines. This leads to an increase in immune system surveillance proteins, meaning the immune system becomes better at identifying and eliminating potential threats, contributing to overall repair and healing.

It's crucial to break a fast correctly to retain its benefits. Gorging oneself with oxidized oils, poor-quality fats, sugars, and refined carbs after a fast creates an inflammatory response. Eating in itself triggers a postprandial inflammatory response. To maximize benefits, ease into food slowly, avoid heavy carbohydrates, and consume clean, nutrient-dense foods for two to three days after a longer fast (36 hours or more). This ensures that the body's repair processes continue and muscle is preserved.