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People with a significantly reduced ability to detect common odors tended to have higher rates of health problems later in life.
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A weaker sense of smell was associated with increased risk of illness and earlier mortality compared with people whose smell remained strong.
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Even when other health factors (like heart disease or lung function) were taken into account, smell loss still stood out as a meaningful marker.
This doesn’t mean smell loss causes death, but rather that it may be a signal of how the body’s systems are functioning overall.
What Could Explain the Link?
There are a few theories:
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Neural Health: The nerves involved in smell are among the first to show signs of degeneration in conditions like Parkinson’s and Alzheimer’s disease.
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Immune and Cellular Changes: A reduced sense of smell might reflect underlying immune system weakness or cellular aging.
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Brain Aging: Since smell is connected directly to brain areas that regulate important functions, changes could mirror broader aging processes.