Multiple studies and systematic reviews indicate that regular consumption of fast food is harmful to health, being associated with adverse physical outcomes like obesity and fatty liver disease, as well as mental health issues.
The claim is specific, empirical, and falsifiable, passing Step 0. The provided literature includes direct evidence that fast-food consumption and closely related ultra-processed foods are associated with negative health outcomes such as obesity, non-alcoholic fatty liver disease, and depressive or anxiety symptoms. There are no papers refuting the claim, making the balance verdict SUPPORTED.