A review of nearly 20 studies suggests that teenagers' diets can significantly affect their mental health. A healthier diet is associated with fewer symptoms of depression. Conversely, unhealthy eating habits can be correlated with higher rates of psychological problems. Studies emphasize the importance of overall eating habits, not just individual nutrients. Overall diet may play a key role in brain development during adolescence. The results suggest that improving teenagers' eating habits could positively affect their mental well-being.