Yeah. All for the opportunity cost of one of those parents being at home to cook three square meals a day.
It is very, very important for people to read and understand the significance of this comment.
Many folks from the "middle"-class on up simply don't understand what life is like for single parents, or even or dual parents who must work multiple jobs to pay the bills. Yes, raw food of the sort that can be prepared into healthy and nutritious meals is not (necessarily) inherently expensive; what puts it out of reach for many low-income folks is not the money but the TIME it takes to go to the grocery store, bring those foodstuffs home, and then prepare them.
Single parents cannot leave their small children unattended that long, and bringing them along adds even more logistical overhead. There often isn't a single grocery store in low-income neighborhoods, requiring an even longer car trip, if the family can even afford a car; otherwise, an even longer bus ride, which also limits the trip to how much can be carried in two hands to, from and on the bus.
Making a healthy diet accessible to low-income families is not an issue of price, it is an issue of availability and logistics, and those issues are NOT insignificant. People need to understand that, to avoid falling into the trap of thinking poor folks are just lazy -- they're not, most of them work harder than you do, I promise you. Unless you've actually been a low-income single parent, don't presume to understand what the challenges are.