Alexandria is right that some people can't afford anything other than the cheapest food. Coupons are only for processed food -- you don't get a coupon for "buy 1 lb. carrots, get a pound free!" More like "50 cents off Red Baron frozen pizza".
It's true that none of us, rich or poor, should eat based on taste. Many things that simply taste good are horrible for you. High Fructose Corn Syrup-laden soda and MSG-loaded flavored potato chips come to mind. Those things aren't cheap, either!
Moving on to the world in general (NOT speaking about Alexandria here! :wink:)...
In fact, many poor people eat MUCH WORSE than they need to. I've seen countless poor families load up their carts at Wal-mart with junk food, potato chips, cases of soda, blue/green/red jugs of artificial drinks (0% fruit juice) and so forth. Some even go so far as to buy alcohol and cigarettes! They certainly can't blame their bad health on their income, since many of those things cost QUITE A BIT! Some people are even dumb enough to buy single serve packages of food/snacks/drinks.
Just like there's no excuse for a poor person's house to look like a dump. Throwing away garbage doesn't cost you anything. Bleach/water/newspaper/paper towels are pretty cheap. If you can't afford paper towels, use old towels or rags. Go to garage sales and buy old clothes and use those to clean. It doesn't cost ANYTHING to pick up a broom and dustpan, or to put your used clothes in a box or hamper or something. Baking soda is dirt cheap, and will solve cat urine and other odor problems. When there's a will there's a way. Some people just "don't care" (they don't have the will to live clean) but decent people WILL care.
I even believe it's charitable to dab some baking soda under your armpits if you're going to forego deodorant as a penance -- there's giving up vanity, and then there's consideration/charity for others! Baking soda is a perfect compromise -- you smell neutral, but you don't smell fragrant. Baking soda is dirt cheap.
Padre Pio lived under the vow of poverty -- but you can bet his cell wouldn't have been described as a "s###hole" or a dump. It was simple, spartan, frugal, poor -- but there's never an excuse for "dirty". He didn't have food crusts on the floor, old pizza boxes, stinky robes from last week in piles on the floor, piles of junk on his desk -- you get the picture.
We aren't supposed to scandalize our clean Puritan-protestant brethren. Being Catholic doesn't mean living in chaos, disorder, filth and germs. The Jesuits actually dealt with THIS VERY PROBLEM when they tried to evangelize India. The Portuguese ate more meat (and had body odor to reflect this) and didn't bathe much. The Indians bathed often and ate a completely different diet. It was a huge (and un-necessary) obstacle for the Indians' conversion to the Catholic Faith.
Read about Roberto De Nobili:
http://en.wikipedia.org/wiki/Roberto_de_NobiliMatthew