Diet has a significant influence on mood and brain health. Nutrient-rich foods, including whole grains, fruits, vegetables, lean proteins, and omega-3 fatty acids, support stable energy and neurotransmitter production. A healthy gut microbiome, nourished by fiber and probiotics, is also linked to reduced anxiety and depression. Conversely, diets high in sugar, processed foods, and unhealthy fats can worsen mood swings and fatigue. Hydration is equally important, as even mild dehydration impacts focus and mood. Building a balanced eating routine helps regulate emotions and energy. While diet alone cannot treat mental illness, it strongly complements therapy and medication. Professional nutritional advice can guide personalized plans.