A client of mine brought this to my attention recently. This statement hits the main points on why examining both mental and physical health is so important.

The Role of Sport, Exercise, and Physical Activity in Closing the Life Expectancy Gap for People with Mental Illness: An International Consensus Statement by Exercise and Sports Science Australia, American College of Sports Medicine, British Association of Sport and Exercise Science, and Sport and Exercise Science New Zealand

Check it out here: https://journals.lww.com/acsm-tj/Fulltext/2018/05150/The_Role_of_Sport,_Exercise,_and_Physical_Activity.1.aspx