Jeffrey Bland explains that the immune system isn't just a defense mechanism but a signaling and regulatory system across the brain, muscle, spleen, pancreas, and liver. Immune cells are replaced every 90 to 120 days, raising questions about whether new cells match the quality of those they replace.
About every 90 to 120 days (every three to four months).
When you really think about what we now know about the immune system, it is a signaling system that translates information from the outside world into all sorts of regulatory functions. At every organ level in our body. There's immune systems in our brain, muscles, spleen, pancreas, liver. So when we start thinking about the immune system, it has this dynamic personality because it turns over about every 90 to 120 days, every three to four months, the cells that make up our immune system get replaced with new cells. Now the question is, are they the same, better than or worse than the ones that replacing.
