Safe
yes it does so you don't get injured
Is water a physiological need?
yes it is
If your girlfriend/boyfriend breaks up with you will you be heartbroken and possibly die?
yes you could get heartbroken and possibly die
Does climbing a rock without a harness safe
no it is not
does it matter if you don't have food for one week?
yes it does because even if you live one week without food you will still get very sick
If you live by yourself is it possible that you can get depression?
yes it is possible
If you are running Is that safe
yes it is because the human body is met to run and have physical activity
If you have no physical activity is that healthy for you
it depends on the case but statically it is not safe