Brain energy improves most reliably with stable blood sugar, quality sleep, and regular movement. Practical steps: protein+fiber at breakfast, adequate hydration, no late-day caffeine. Aim for 150 minutes/week of walking plus strength work; this supports cerebral blood flow and neurotrophic signaling. Use single-task focus blocks (45–60 minutes) with short off-screen breaks. Omega-3-rich fish and good sleep support attention and memory. If cognitive symptoms are new, progressive, or significant, consider evaluation for B12 deficiency, thyroid imbalance, mood disorders, or sleep apnea.