Subjects were instructed to consume as much or as little as desired.
The study also lasted 2 weeks and had less than 40 people in it. This is a bullshit study, we know people are going to eat ultra processed foods because it tastes good. Hell I’m guilty of it even, I will eat an entire pizza on my own if I don’t stop myself. This study should say, people lack will power to not eat free fast food… it’s a complete nothing burger of a study.