There are helpful primers on the role of different fats, the importance of protein and how excess weight plays into harmful inflammation in the body, which is linked to heart disease and other chronic conditions.

WSJ: Healthy Reader: 'Thinner This Year,' by Chris Crowley and Jen Sacheck

Players control a tiny robot who travels through the human body to destroy harmful cancer cells.

CNN: 'Shoot-em-up' helps teens battle cancer

Prolonged sitting can be harmful to your health because of the lack of muscle contractions and subsequent body movement.

FORBES: Why Sitting Increases Your Risk of Dying Sooner

People under harmful stress lose the ability to re-engage the parasympathetic nervous system, which drives the body's day-to-day natural functions, including digestion and sleep.

WSJ: When Stress Is Good for You