Humans can survive for up to 45 days without food, the body has an innate capability to begin utilising fat stores and feed ourselves from our bodies own stores. This is why many people on hunger strikes can live for such a long period of time without food. Without Water the body can continue functioning for up to 3 days, were people to be on a water strike they would last a much shorter time period! This is because the body is made up of about 4/5 water, without water going into the body it effectively dries up, allowing someone to live for up to 3 days.
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