I work very hard to stop this happening, buying big supplies when I can afford to, using my freezer to the max, and planning and using leftovers cleverly.
However I am starting to see how it happens now.
There are a few occasions where I haven't had dinner with the kids, but used up scrappy bits and pieces.
Gone without lunch to stretch the bread to do another day of packed lunches. Eaten very weird combinations of stuff because that's what's there.
Started growing my own food and trimming weeds in the garden for the rabbits to supplement them as I can't spare veggies.
My money is very tight at the moment. I am waiting for DLA, trying to arrange debt management and sort out repayment plans, pay rent on a house that isn't wholly covered by my housing benefit (but which is more suitable), pay for all the extra costs trying to cope with chronic illness, whilst receiving no support from either of the kids fathers financially (though DS's dad does pay for other things that I would rather he continue than pay measly amount of maintenance, like DS's swimming lessons).
It's not always that I don't have money, it's that I don't have it right then and have to last X amount of days until I do have money. It's getting a lot tougher.