How does a burger actually become you?

How does a burger actually become you?

Down the hatch it goes, landing in a churning pouch of acid so strong it could dissolve a razor blade.

But hydrochloric acid doesn't actually digest the burger. It just wakes up the real star: an enzyme called pepsin, which acts like microscopic scissors snipping apart the meat's proteins.

So why doesn't this brutal acid bath digest your own stomach? Your body constantly paints the inner walls with a thick, neutralizing layer of mucus.