In the Bible it says that Jesus survived in the desert for 40 days and nights without food and water, is it even possible to survive that long without food and water?
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You can't live without water for over 3 days, 5 days at the very most. It also depends on the environment (climate etc.), on your age and on how much physical activity you perform but 3 days is generally a very accurate number. The reason it takes such a short time to die of dehydration is because the lack of water attacks numerous organs at the same time. Contrary to food, water can't be stored in your body. So if you're in a desert or on an island without any fresh water, you will feel very thirst very soon. The less water you've got in your body, the more difficult it becomes for the blood to flow. This means that less oxygen is carried to the organs, including your brain. At the same time, people who dehydrate usually lose essential electrolytes, which help the brain to function properly. However, the most dangerous part about dehydrating is that your kidneys don't work properly anymore. Already after 1 days of not drinking anything, your urine turns dark yellow. The reason for this is that your kidneys try hard to get liquid out of your body but there's just not much liquid left. Once you stop peeing altogether, your kidneys can't discharge of the various poisons anymore that you have in your body. Eventually, you die either because your kidneys stop working (kidney failure) or because your brain or heart shut down. This all happens very fast. Already 5% less water in your body can be dangerous for you. Dehydration takes very short time but it's usually an extremely painful way of dying. First you just feel cranky and agitated. It becomes harder and harder to make rational, calm decisions. If there's still no water around, you get a very painful headache. Your blood pressure rises a lot, which in turn causes dizziness. You feel nauseous and you might even vomit (thereby losing even more liquid). The potassium in your blood increases to dangerous amounts. You become very restless and you might have panic attacks. Your muscles feel as though they're on fire because they're desperately trying to suck water of your body. If by that point, you still don't have any water, you get a very nasty fever and your vision becomes blurry. It becomes difficult to articulate yourself and you feel extremely weak. Finally, you start to hallucinate and think/talk all kinds of crazy/weird things and slowly fall into a coma. After that, it takes a few hours and you're dead. A total body fluid loss of 15-20% is considered lethal.
As for food, you can live without it for0