The documents reveal that TikTok's own research found a strong correlation between compulsive usage and negative mental health effects, including depression, anxiety, and sleep disturbances. Despite this knowledge, the company has continued to design its app to be highly engaging, with features such as infinite scrolling, algorithm-driven content, and notifications that keep users hooked. This has led to a situation where young users, in particular, are spending excessive amounts of time on the app, often to the detriment of their mental and physical health.