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)
The body can no longer keep up with the demands placed on it
Evaluating your fitness level before, during, and after, shows you progress throughout the fitness program.
it has to have no artificial ingredients