The best thing you can do is treat your body with respect! I say that because most people eat whatever they want an that is ok, but it has to be in moderation. Over eating, drinking, smoking or abusing your body can lead to a weak immune system. When your immune system is weak you will get sick because viruses and bacteria are around us at all times. The door handle, computer, cell phone and many other things you come in contact with daily carry germs, so wash your hands regularly.
Source: Immune System
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