Hi Natalie,
My AirBnB is in the upper midwest of the USA and it seems leaving snacks to be a common thing here
Yes, I do provide simple food:
Breakfast bars
Instant oatmeal
noodle soup
popcorn
and I left any can, closed packages, etc. that previous guest leave
I also provide a variety of flavored creamers for the coffee, tea and water (even though my water has been tested frequently and approved by my city).
I find that when travelers arrive, it's nice to have a quick snack.
As a traveler myself it has always been a welcomed surprise to find snacks as well.
Hopes this help