Fat Chance Of Understanding Protein

(Our store currently has a not-as-well-known brand of lunch meat on sale. I am helping a customer at the office when another customer comes up and interrupts, holding two cans of the lunch meat.)

Customer: “This can—” *points at the “light” can* “—says it has eight grams of protein. This can—” *points at the regular can* “—has only seven grams of protein. Why is this one labelled as the light one?”

Me: “Can I see the light can, sir?”

Customer: *hands me the can*

Me: “Oh, this one is 25% less fat. It’s not lighter in protein.”

Customer: “Oh, not light in protein.”

Me: “Nope, just lighter in fat.”

Customer: “Oh.” *to the customer I was helping* “Why would I want it with less fat?”