The American Psychological Association Help Center provided recent statistics that validate the importance of mental fitness and mental health.
The importance of the mind/body health are indicated in the following statistics from the APA Help Center in an article entitled Mind/Body Health: Did You Know?.
Psychological studies show that your mind and your body are strongly linked. As your mental health declines, your physical health can wear down, and if your physical health declines, it can make you feel mentally "down." A positive outlook can help keep you healthy.