"Pineapple-Sized Immune System Discovered in Groundbreaking Study"
The human immune system consists of approximately 1.8 trillion cells, collectively weighing about 1.2 kilograms or 2.6 pounds, which is roughly the same weight as a pineapple. Researchers from the Weizmann Institute of Science in Israel conducted a comprehensive study to estimate the distribution and mass of immune cells in the human body. They found that the lymphatic system and bone marrow house the majority of immune cells, while the gastrointestinal tract contains only a small percentage. The study provides insights into the composition and organization of the immune system, shedding light on the largest reservoirs of immune cells and their implications for health and disease.