I believe that it relates to or involves free oxygen, if it is used in exercise- aerobic practices help improve the the efficiency of the body's cardiovascular system with absorbing and transporting oxygen.
Hope this helps
Sodium because its okay if you eat a small portion of it but too much can be bad for you
Don't smoke
wear sunblock
eat healthy
Blood sugar that's either too high or too low for too long may cause various serious conditions, all of which can lead to a diabetic coma