Bananas will protect you

Every morning, I grab a banana from the kitchen and head to work.
The banana is there to protect me.
From what?
I have no willpower. I cannot resist the breakfast shops along the way to work.
But the moment I catch the smell: donuts… kolaches… breakfast tacos…
I peel the banana and take a bite.
Instead of being tempted by the unhealthy fare, I eat my banana and make it into work.
As I toss the peel into the trash, I look up and see…
Someone brought in a box of donuts.
(That’s when I pull out my sledgehammer.)