Do you heat your pantry, closets and empty guest rooms? Do you heat hobby rooms or bedrooms all day long when no one is in them?
You're wasting home heating energy and money if you do.
It's a simple thing to close vents and keep the doors closed to unused rooms. Go a step further and make or buy draft stoppers if there is a gap under the door. Weatherstrip the inside of pantries and closets and wherever else it may be appropriate.
The idea is to seal these rooms away from the rooms you want to heat. Less space to heat = less money to heat it.
Note: It would be very unusual for food in a pantry to freeze unless it's on an outside wall and your house gets really, really cold, but keep potatoes and other fresh foods toward the inside wall for the best flavor.