Why Does My Bodyguard Fight Flowers?How being too clean can make your system overreact.

From the show

Oh, god... really?

Understand the science behind your body's allergic 'false alarms'. Allergies are an immune overreaction to harmless substances, triggering everything from itching to anaphylaxis. A leading theory, the 'hygiene hypothesis,' suggests our modern, sterile environments prevent our immune systems from being properly trained in childhood, making them prone to these mistakes.