These aren't properly prepared chickens. They are McChickens. They are fast food that is full of artificial crap to make it taste good.
Low income people eat a lot of fast food because it's an affordable luxury for them. That doesn't mean it's not a luxury, or that it's a good choice to make a regular part of your diet. Especially due to the long affects.
One of the first things you figure out when you get out of being poor is that paying more for food is not a luxury, it's a necessity for a higher quality of life overall. I got this lesson in college, which was the first time it was regularly available to me.
when I was 14 years old and eating shitty food everyday, I thought healthy food was 'gross' and 'crazy expensive'. I was wrong. I was just poor and trapped in a poor person's mindset and had no idea about long term costs because i was consumed with getting things as quickly as possible for as cheap as possible.