Inside the human body, a quiet cleaning system works around the clock. It breaks down damaged parts, recycles what can be reused and clears out cellular waste before it becomes harmful. This process is called autophagy. The term comes from Greek, auto meaning “self” and phagein meaning “to eat”, literally translating to “self-eating.”
In 2016, this invisible process stepped into the global spotlight when Japanese cell biologist Yoshinori Ohsumi received the Nobel Prize in Medicine for uncovering how autophagy works. His discoveries helped explain how cells renew themselves and why this recycling system is vital for health. When Ohsumi began his research, autophagy was barely noticed. Today, it is one of the most studied topics in modern biology.
Autophagy is activated by starvation, as cells begin breaking down their internal components to recycle nutrients and maintain energy balance when external resources are scarce. This is why fasting is considered one of the most effective ways to stimulate autophagy.
Ohsumi started the field of autophagy research by studying yeast. His work showed that these essential recycling genes also exist in humans, and that their mutation can contribute to disease. Autophagy is the mechanism that helps organisms survive periods without food.
Fasting has also been associated with practical health benefits. Studies suggest it may improve blood sugar regulation, reduce inflammation, support brain function, and aid in weight management. Autophagy offers a biological explanation for many of these effects, connecting ancient practices to modern science. In Ikaria, Greece, a recognised Blue Zone known for exceptional longevity, residents still follow about 150 religious fasting days each year.
Perhaps the most striking lesson from autophagy research is where it began. Not in flashy laboratories, but through patience, curiosity and close observation. It is a reminder that some of science’s most powerful discoveries emerge quietly, reshaping how we understand health, survival and the wisdom hidden within our own cells.
