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These numbers are from memory, and may be wrong, but you'll get the general idea...
A newborn baby requires 240 calories/kg body weight/day to maintain weight.
A 20 year old requires 120 cal/kg/day.
A 40 year old requires 60 cal/kg/day
A 60 year old requires 33 cal/kg/day
So... Every 20 years your dietary input should be reduced by half if you want to maintain weight.
Again, these numbers are imprecise, but give you the general idea.
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My work here is nearly finished.
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