Stress accumulation can lead to suicide attempts, self injury, unhealthy stress, anger, rage, fear, depression, unhealthy coping mechanisms, focus problems, and more.
There's negative and healthy ways to react to stress. I picked up on DBT/CBT in treatments and more positive coping skills; those include listening to music, going to therapy appointments, advocating for self, running, organizing, drawing, writing, walking, etc. Where as for negative coping skills, I'd self harm, engage in Eating Disorder behaviours, lie, "break down", ignore others, isolate, etc.
Crushing a can. Melting an ice cube. Boiling water. Mixing sand and water. Breaking a glass. Dissolving sugar and water. Shredding paper. Chopping wood.
Because the documentary proved in many aspects (displaying change in weight, statistics of people eating McDonald's worldwide, etc) that McDonald's impact is ridiculously bad. It is hard for them to oppose that directly to the man in the documentary who got sick and became incredibly unhealthy from his diet on McDonald's.