Tag: Fasting risks

While the human body is remarkably resilient, its capacity to endure a lack of nutrition has definitive limits. This guide explores the physiological processes the body undergoes and answers: How long can a human last without food?

According to research on human fasting timelines, a 72-hour fast can trigger profound metabolic changes, including shifting the body's primary fuel source from glucose to fat. This metabolic switch is the core of understanding **what do 3 days of no eating do to your body?** It's a complex process of survival and repair that health experts are still studying.