The older I get the less junk food I eat. It's never very healthy and usually high in calories and unhealthy fats. The issue with people being "addicted" the junk food is real, some people are getting a dopamine rush from it and they keep eating. It's really an eating disorder in all reality if you think about it.
I think eating healthy and more natural foods is a smart move. Limit amounts of red meat and sugar, and watch your caloric intake. I gain weight easily now so I watch things very closely.
A word of warning for crash dieters who eat next to nothing to lose weight, it can cause serious and even fatal health problems. I had a friend do that and ended up in the hospital for a week!