You're assuming that said people know how to cook, and have the equipment to cook. A LOT of poor people weren't even taught basic cooking skills by their parents or guardians.
Are you kidding me?
Water, oil/fat, 1 pan and a heat source is all you need in the equipment area, and unless poverty in the US has actually become what most Europeans think it has become, those things should be easily available to everybody.
And 'knowing how to cook'? Jesus Christ, it's not fucking rocket science.
1. Put water in pan, add X to water, boil until it is edible. Add some salt.
2. Put oil in pan, add Y to pan, fry until it is edible. Add some salt. Maybe some sugar.
rice cookers or slow cookers
Or, or, or: just use a normal fucking pan. Those things aren't magical devices using spooky technology, you know?
I'm not disputing that eating right when impoverished isn't hard, just that "I don't know how to cook" or "I don't have any cooking equipment" are terrible, terrible excuses.