Weekly Health Quiz: Autophagy, Toxins and Depression

1 Which of the following can predict whether you'll contract influenza after exposure to the flu virus?

• Having a vitamin D level below 60 ng/mL
• Having an omega-3 index below 8 percent
• Having a natural killer cell ratio below 10 percent

  Recent research found people whose immune cells consisted of 10 to 13 percent NK cells remained disease free after exposure to the flu virus, whereas those below 10 percent became ill. Learn more.

• Having a natural killer cell ratio above 10 percent in combination with high vitamin D