19/03/2026
Currently at university, we get told "defensive proteins protect against disease", with antibodies as the hero taking out bugs. Cool story, but honestly? It's misleading. Most people hear "disease" and picture germs-yet autoimmune stuff exists because these proteins ara busy inside us, not out there.
Real deal: the immune system (and its proteins-antibodies, complement, peptides) spends the bulk of its time on homeostasis. Clearing dead cells, fixing leaks, tagging junk, calming overreactions. External invaders? Sure, they get dealt with-but that's like 5-10% of the gig (and perhaps we can say that too is a clean-up activity rather than a defence (the so-called invaders might even be specialised agents/materials for specific renovations or cleanups, as set in over time the optimal path for our biology-as per an underdog perspective in biology (terrain theory vs germ theory)). The rest is housekeeping.
Proof? Check Nature Reviews
Immunology (2018)
Matzinger & Kamala: "Over 90% of antibody/complement activity is self-regulation, no pathogen hunting." It's not sexy like "battling viruses*, so textbooks skip it. But that militaristic vibe? It skews how we see biology—like our body's a warzone instead of a self-cleaning machine. There's heaps more where that came from. The field seems to have been shifting hard toward immune-as-housekeeper for years. If you're keen, I can dump a few extra refs.