Lol, that you are not aware of these people is a concept so foreign to me that I kind of suspect you are joking. There are many people in my life who struggle with both, more people than who don’t..

>Like are there people who really prefer junk food over good food even in the moment, or have to get their will power up to read a good book?

Yes these people are more common than not.

If you get into a deep enough "convenience" spiral, you lose the physical energy to engage in things like reading a book.

I was once so depressed that I didn't leave my room except to use the bathroom for months, and in that time I developed lethargy so extreme that I couldn't even play causal FPS video games competently. My brain simply didn't work as well, despite having all the calories it needed.