Emotional Clarity Modulates the Link Between Inflammation and Depression, Study Finds

A study of adolescents found that individuals with low levels of emotional clarity who also exhibited higher levels of the inflammatory markers interleukin-6 and C-reactive protein were more likely to experience severe symptoms of depression five months later. The paper was published in Brain Behavior and Immunity.

Depression is a mental health disorder characterized by persistent feelings of sadness, hopelessness, and a loss of interest or pleasure in activities. These symptoms interfere with daily life, relationships, and productivity and, in severe cases, may lead to thoughts of self-harm or suicide. Depression can also affect physical health, causing changes in appetite, sleep disturbances, fatigue, and difficulty concentrating. While it is one of the most common mental health disorders, treatment efficacy remains limited, with a large proportion of cases being categorized as treatment-resistant depression.

Some researchers have observed that the behaviors of individuals with depression resemble those of people who are physically ill. These behaviors, referred to as “sickness behaviors,” include fatigue, concentration difficulties, slower motor function, and reduced interest in daily and social activities. When a person is injured or infected, these behaviors reduce energy expenditure on daily activities, allowing the body to focus on healing and limiting the spread of infection. Sickness behaviors are mediated by pro-inflammatory molecules produced by the body.