Generate a full detail guide on the connection between nutrition and mental health. The guide should be informative and avoid making prescriptive medical claims. It must include sections on: 1. The Gut-Brain Axis Explained Simply. 2. Nutrients and Foods That Can Support Brain Health. 3. How Certain Foods Can Impact Mood and Energy. 4. Tips for Mindful Eating. Please include a strong disclaimer that readers should consult a doctor or registered dietitian before making significant dietary changes.