This is very wonderful explanation given by Niroshan. He gave the explanation in Tamil language (one of the Indian language).
Here its rough translation:
How long can someone survive without food?
Its not immediate death for starving. Normally, people can easily live for 2-3 days without any food or water.
Without oxygen : 5-10 minutes, people can live
Without water: 2-7 days, people can live.
Without any food : 2 months (no disease- can live )
starving lead to 3 stages for living:
Stage 1: glucose from last food..
25% energy... used by brain...
Stage 2: lipids are broken and a condition characterized by raised levels of ketone bodies in the body, associated with abnormal fat metabolism and diabetes mellitus.
only for brain, heart and important function
Stage 3: brain started consuming less glucose.
if all ketone body empty, then all amino bodies eaten up for energy.
Our body is very amazing, not one back up plan, actually 3 back up plans for starving.
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