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What if all human currently become immortal? Those who lived at particular fraction of time gain immortality and newborn don't have it .

So the ages of people on earth currently will become constant and are going to stay forever. The new born can grow up to produce normal humans. But the immortal population will stay constant .

The immortal will still need food as usual.

How to calculate food consumption and with every day increasing population under this scenario?

**Note:* What happens to immortal if they do not eat is irrelevant. Assume that they will still need to eat.

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closed as unclear what you're asking by Aify, sphennings, L.Dutch, Vylix, Slarty Nov 25 '17 at 23:25

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    $\begingroup$ Is there a way to kill immortals? Can they be harmed? $\endgroup$ – Piomicron Nov 25 '17 at 11:37
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    $\begingroup$ You say "the current population becomes constant" but also mention increasing population. Which is it? $\endgroup$ – user535733 Nov 25 '17 at 13:14
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    $\begingroup$ In that case, if an immortal went for say, 8 weeks without food, would they be able to move? What if at this point, somebody beheaded them? $\endgroup$ – Piomicron Nov 25 '17 at 14:24
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    $\begingroup$ Theoretically they could still be buried, thrown into volcanoes, thrown into space or tossed into wood chippers. Also, could people still have children? Would those children be immortal too? The question kind of answers itself. Somebody would figure out a way to kill or permanently disable somebody else and they'd take it from there. $\endgroup$ – userLTK Nov 25 '17 at 15:14
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    $\begingroup$ Children born after the Event will grow up... but as I understand it, a 1-month-old baby at the time of the Event will be an immortal 1-month-old forever? That's harsh, man... harsh. $\endgroup$ – Ghotir Nov 27 '17 at 15:47
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The amount of food needed right now = X.

The population right now = immortal population = Y.

Food per-person = X/Y.

New population at a particular moment = Z.

Food needed at that moment = X(1+Z/Y)

I leave it as an exercise for the reader to use Google to find the the appropriate values.

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