(HealthDay News) -- The immune system helps your body fight off germs, protecting you from getting sick.

The ADAM Encyclopedia suggests these ways to help support your immune system:

  • Avoid exposure to secondhand smoke.
  • Don't take antibiotics when they aren't necessary. The more you use these medicines, the more likely they won't protect you from a future bug. Remember that antibiotics fight bacteria, not viruses.
  • Drink plenty of water.
  • Eat yogurt with "active cultures," in other words, beneficial bacteria.
  • Get plenty of sleep. Insufficient rest means you're more likely to become sick.