Disease forms when your body cannot eliminate waste or foreign particles. Your immune system protects you from disease via its immune memory. Much like a memory bank, whereby your body builds up resistance to infections via exposure. Logging information and presenting a barrier to specific infections.

Like our memories, this system isn’t perfect.

Your body can forget how to fight off some diseases. For example, tetanus immunity will last up to a few decades. Whereas naturally occurring immunity is remembered for much longer.