8. Gut Lining Cells: Fast Turnover
The cells lining your intestines—called epithelial cells—are among the fastest-renewing in the body, replacing themselves every 3-5 days. This rapid turnover is essential for maintaining a strong barrier against toxins, bacteria, and other harmful substances that pass through the gut.
By continually shedding and regenerating, your gut lining helps keep infections at bay and ensures efficient nutrient absorption. For more on this protective process, visit National Center for Biotechnology Information (NCBI).