it depends on the food you put into the foil
So that food can be conviently stored and preserved in long term.
food to keep them alive
Well if its spoiled or "gone off" its bad, why keep it?
There is A LOT of food in the world, there is a never ending amount of it as long as animals keep reproducing and plants keep on growing.
Most any cooked food will keep in the refrigerator for about 3-4 days.
too general . Need Specifics
Through their refrigenerater.
Three or four days is a safe amount of time to keep food as long as it is refrigerated.
I put the rest of food into glass container and put this container to refrigerator. But I do not keep this food for a long time.
keep it in the refrigerator, and when you take it out, you can put it in a toaster or toaster oven
The population of any animal will keep growing as long as they have sufficient food and not many predators.