Fats

Saturated fat, the artery clogger found primarily in red meat and dairy, isn’t just bad for the heart.
New research suggests it can also hurt the brain.
Good fats, specifically the monounsaturated kind found in olive oil, nuts, avocados and seeds, appear to be linked to better cognitive function and memory over time. Eating a diet high in the saturated stuff is associated with exactly the opposite.
To keep your noggin sharp, avoid full-fat cheese and dairy, red meat, poultry skin, and baked goods made with butter or shortening.
 Supplement your diet instead with pumpkin and sunflower seeds, nut butters, whole nuts and olive oil.