A lot of the food that lower class families have available, stuff which is non-perishable, tend to have empty calories and less fiber. Soft drinks are a problem, and they're cheap.
That isnt to say that we cant or shouldnt do more about food insecurity, but wrt the GP post, it isnt the biggest factor.
The parent's attitude is absolutely a factor which was what my original message (up a bit from here) was about, but I don't think that you can deny that food insecurity plays a part in their attitude toward education.
It is stressful, which doesn't help, bit there are many stressful situations across all walks of life which can be stressful for extended periods of time.
Basically, I think we are agreed it is a problem worth addressing. I don't think we agree that addressing food insecurity will necessarily translate into better attitudes towards doing well in school.
https://www.tandfonline.com/doi/full/10.1080/19320248.2010.5...
However, my general impression is that the primary reason he is truant, has reading level of a 3rd grader (he is in 7th grade), doesn't do homework or make an effort in school, etc. isn't so much that he consumes a lot of empty calories. The primary reason IMO is that his single mom is 100% checked out of his education. And actually, more than just his education - practically his entire life. She has no idea who his teachers are, what his grades are, or even what his attendance is. He practically raises himself because his single mom is too burned out after working her jobs and other responsibilities. So... as a result, he drinks a lot of soda, eats a lot of fast food, plays a lot of video games, watches a lot of anime, doesn't go to school, doesn't read, sleeps on a very irregular schedule, etc.
This is true, but which is the bigger factor in America: parent(s) who are uneducated themselves and do not take an active role in their childrens' education OR food insecurity? I would argue the former. I remember a recent story about Baltimore single mom Tiffany France being shocked that her kid (a senior in high school) wasn't going to graduate because he had a 0.1 GPA (the story was that that was one of the top GPAs in the school). Like... how checked out do you have to be from your kid's education in order to not know that your kid is rampantly truant and has <1.0 GPA over the course of 4 years? Not to downplay her own struggles; part of the reason she's checked out from her kid's education is likely due to dealing with her own jobs/responsibilities/issues. So for that reason alone even having 2 parents is a massive educational advantage over their peers.
Food insecurity exists, but also there is an obesity epidemic and single parenthood epidemic in America among various lower classes and based on personal experience I tend to think parent mentorship (or lack thereof) plays a far bigger role in kids' education than food insecurity.