The body of a typical 70 kg adult human contains ~1 kg of calcium, almost all of it in the form of bone mineral. Under normal conditions, a person loses ~175 mg of calcium per day in the urine and replaces a similar quantity of calcium by absorption through the gut. If a person suddenly stopped consuming any calcium at all but the rate of urinary calcium loss remained the same, how long would it take for the body calcium stores to decrease by 5%?

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