Their results are:

Participants who consumed high amounts of ultra-processed foods tended to have unhealthy habits and problems away from the dinner table.

Notably, they had greater BMI (body size), higher smoking rates, and increased prevalence of comorbidities like diabetes, hypertension, and dyslipidemia (an imbalance of fats, such as cholesterol) and were less likely to exercise regularly.

Makes sense. The foods are mass produced, calories dense, and cheap. This study ties in with other studies that discuss how obesity is linked to lower income households because of cheap and unhealthy calories. Add on top the stress of their finances, unstable life, and lack of joy in their life, most would turn to food for a small glimmer of it; it's comforting.