Lowering cholesterol affects the endocrine system. In men, if the cholesterol isn't high enough, they can't produce testosterone. The first thing affected is the brain as cognitive abilities are reduced and amnesia can occur... later impotence occurs. Depression is also a symptom of a low cholesterol and a lowered hormonal level which often leads to even less production of testosterone.
Emotional flat lining is also a side effect of statins...some even produce phychosis and personality changes.
My DH had all of this.. took him off fat free food, stopped his statins, and put him on low carb...fed him steak and green vegetables everyday, got him some hormonal therapy (natural testosterone not synthetic) and it took him nearly a year to return to his normal self. Many men think it's just old age. Not so!