Weekly Health Quiz: Exercise, Hypnosis and Facebook

1 The following lifestyle factor has been scientifically shown to be as potent a risk factor for premature death as smoking:

• Lack of grounding
• Sun avoidance

  An estimated 12 percent of all U.S. deaths may be linked to inadequate sun exposure, and sun avoidance is as potent a risk factor for death as smoking. Learn more.

• Electromagnetic field exposure
• Having a body mass index below 35