Brain Health: Genes & Biomarkers — Optimization Table Gene / Biomarker Suboptimal Factor Free Actions Non-free Actions GENES APOE ε4 ε4 allele carrier Mediterranean diet; aerobic exercise APOE test; lion's mane BDNF Val66Met Met/Met genotype HIIT; cold exposure Mg-L-threonate; lion's mane MTHFR C677T TT or CT variant Leafy greens; no alcohol Methylfolate; methyl-B12 COMT Val158Met Val/Val (fast COMT) Meditation; stress reduction L-tyrosine; rhodiola BIOMARKERS Homocysteine >10 µmol/L Leafy greens; limit alcohol B12, B6, folate supplements Vitamin D <40 ng/mL 20 min sun/day D3 + K2 supplement Omega-3 Index <8% Fatty fish 2× per week DHA/EPA supplement HbA1c >5.4% Low-carb diet; exercise CGM device; berberine hs-CRP >1 mg/L Anti-inflam. diet; quality sleep Curcumin; fish oil Morning Cortisol Elevated AM level Sleep hygiene; meditation Ashwagandha; sauna Vitamin B12 <400 pg/mL Daily animal-source foods Methylcobalamin supplement