“Autophagy allows your body to break down and reuse old cell parts so your cells can operate more efficiently. It’s a natural cleaning out process that begins when your cells are stressed or deprived of nutrients.“ ~ Cleveland Clinic

Autophagy (pronounced “ah-TAH-fah-gee”) is your body’s process of reusing old and damaged cell parts. This “self-eating” mechanism (from Greek “auto” meaning self and “phagy” meaning eating) helps maintain cellular health, especially during stress like nutrient deprivation.

Cells are the basic building blocks of every tissue and organ in your body. Each cell contains multiple parts that keep it functioning. Over time, these parts can become defective or stop working. They become litter, or junk, inside an otherwise healthy cell.

Autophagy is your body’s cellular recycling system. It allows a cell to disassemble its junk parts and repurpose the salvageable bits and pieces into new, usable cell parts. A cell can discard the parts it doesn’t need.

Autophagy is also quality control for your cells. Too many junk components in a cell take up space and can slow or prevent a cell from functioning correctly. Autophagy remakes the clutter into the selected cell components you need, optimizing your cells’ performance.

Autophagy ramps up during fasting or calorie restriction, aiding survival by conserving resources.

The Autophagy process clears cellular debris, fights infections by destroying pathogens, and may slow aging by preventing junk buildup in cells. Research links enhanced autophagy to reduced risks of neurodegeneration, cancer prevention (early stages), and metabolic health.

Fasting, exercise, or low energy states activate it, but excessive autophagy can lead to cell death in extreme cases. As we age, autophagy efficiency declines, contributing to disease.

Source: https://my.clevelandclinic.org/health/articles/24058-autophagy