At least 30 minutes per day
It is true that blood alcohol level (BAL) is the ratio between the
alcohol consumed and the blood in the body. It refers to the percentage
of alcohol found in your bloodstream. If this percentage is above a
certain level, and you are driving, for example, a police officer can
take you into custody for driving while under the influence of alcohol.
Dementia and Delirium are two somewhat broad biological phenomenon that are biological causes of mental illness. These interfere with biological processes with the brain. If we wish to be more specific, Cancers, Alzheimer and Parkinson's Disease can affect the brain by pressing on important aspects (Brain Cancer's) and/or cause progressive degeneration (Alzheimer and Parkinson's)