Fasting Trends Hide Serious Health Risks, Experts Warn

Fasting has gained popularity as a health trend, but medical experts warn of serious risks. Practices like the 16/8 method—16 hours of fasting with an 8-hour eating window—can harm the heart, digestion, and nervous system if overused. While some studies highlight benefits, the dangers often outweigh them for many people.

The idea of fasting as a healing method dates back thousands of years. Ancient Egyptian texts, such as the Papyrus Ebers from 1600 BC, recommended it for health. Greek physicians like Hippocrates later promoted fasting, and religious traditions adopted it as a spiritual practice. In the 19th century, naturopaths such as Sebastian Kneipp revived fasting as a natural remedy. Modern interest grew after research linked it to cellular benefits, including improved resilience and autophagy.

Yet the risks remain severe. Prolonged fasting can lead to nutritional deficiencies, cardiovascular strain, and ketoacidosis—a dangerous buildup of toxic ketones in the blood. Diabetics face especially high risks. Mental effects include irritability, depression, anxiety, and difficulty concentrating. Certain groups should avoid fasting entirely. Pregnant or breastfeeding women, as well as those with chronic conditions like diabetes, heart disease, or kidney disorders, are particularly vulnerable. Even for healthy individuals, long-term fasting demands strict medical supervision to prevent serious harm. Experts stress that safer alternatives exist. A balanced diet, regular exercise, and stress management can provide similar benefits without the dangers of fasting.

Fasting may offer some advantages, but its risks are well-documented. Without careful oversight, it can damage physical and mental health. For most people, traditional healthy habits remain the safest way to achieve lasting wellbeing.