Question

How depression can be prevented biologically?

Answer 1

eat healthy
do meditation ,exercise 
prevent negative thoughts
smile

Answer 2

Ans=Depression is an extremely complex disease. No one knows exactly what causes it, but it can occur for a variety of reasons. Some people experience depression during a serious medical illness. Others may have depression with life changes such as a move or the death of a loved one. Still others have a family history of depression. Those who do may experience depression and feel overwhelmed with sadness and loneliness for no known reason.