I’d rather have cheese if I’m on a train and don’t need carbs for fuel. If I was riding a bike, I might feel differently.

If there’s a disparity in your bread/cheese supply, you could stretch it out by only eating one slice of bread at a time, folding it over a whole piece of cheese (also folded).

If I keep track of the quantities, I could definitely make the numbers match in the end. That’s probably a better approach than my “just wing it” style.

It seems improbable that you would get down to just a few pieces of bread and cheese and not notice the disparity unless you have some magic sack containing bread and cheese without the ability to see inside like some monkey’s paw wish.