As we grow old our body dries

In childhood and youth water accounts for approximately 60% of body mass, whereas in the elderly it may reduce to 50%. Part of this decrease is due to loss of muscle mass, which is replaced by less hydrated fatty tissue, but ageing also causes loss of the water inside the body cells, lowering their metabolic capacity to produce certain biomolecules, with such various effects as skin wrinkles or alteration in renal function. The lower body water content of elderly people increases the risk of dehydration, with the aggravating circumstance that their sensation of thirst is lower.


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