<s>[INST] If diastolic Blood preasure is below 60 , wouldnt 54 impair circulation of blood flow to the brain & cells  in your body?   86 yrs  concerned w/ low diastolic preasure & memory health. I guard my memory & try to protect it w/diet & games.  So far so good. [/INST] Dear Thanks for your query. As circulation in brain is maintained through certain reflex mechanisms, only moderate to severe degree of sudden change in blood pressure can effect the flow to brain. The brain adjusts the flow for its needs depending upon your long term average pressure, mostly irrespective of absolute values. Hence, 54 or 60 mmHg diastolic BP will not impair circulation if it is so for many months. SincerelySukhvinder </s>