Proper nutrition plays a crucial role in the mental health of teenagers. Research has shown that a balanced diet can have a significant impact on mood, behavior, and overall well-being in adolescents.

For example, a diet rich in omega-3 fatty acids, found in fish, nuts, and seeds, has been linked to lower rates of depression and anxiety in teens. Conversely, diets high in processed foods, sugar, and trans fats have been associated with an increased risk of mental health issues.

Furthermore, nutrient deficiencies, such as low levels of vitamin D, B vitamins, and iron, can contribute to symptoms of depression and fatigue in teenagers.

References:

• "The role of nutrition in children's and adolescents' mental health: A systematic review" - https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6413197/
• "Nutritional psychiatry: Your brain on food" - https://www.health.harvard.edu/blog/nutritional-psychiatry-your-brain-on-food-201511168626