Stop Fearing Cholesterol. The Highest Concentration of Cholesterol occurs in your Brain where it plays an Especially Important Role in Memory Formation. Seniors with the Highest Cholesterol Levels have the Best Memory Function. Cholesterol also plays a Major Role in Regulating Serotonin Levels in your Brain while Low Cholesterol Levels are associated with Depression, Antisocial Behavior and Suicide. Saturated Fats are Stable and Don't Create Damage in your Brain like Polyunsaturated Fats do. Eat Real Food!