Key Findings: No associations of Mediterranean or DASH dietary scores with overall cognition and cognitive decline over six years were found. Higher intake of legumes and nuts was related to better overall performance in global cognition (β=0.091; 95% CI:0.035, 0.146; P=0.001) and to multiple cognitive domains, and to less decline in global cognition (β=-0.016; 95% CI: -0.032, -0.001; P=0.032). Study findings suggest that greater consumption of legumes and nuts maybe important to slow cognitive decline with age.