The definition for the largest category is a subjective feeling of not being able to buy all food options you would buy.
The narrow categories which have better defined criteria also include anyone with any administrative dysfunction which limits their ability to plan or navigate serivces. Which is a real and different problem from having edible mass.
To put it another way, almost everything you need to do to survive as an adult in the US is harder than acquiring food. The problems you have in this category are a bottomless pit.
They should be on a shelf with a giant "FREE" sign. You act like it is so hard to give away food instead of throwing it in the dumpster. Well it isn't.