- It is generally accepted that the human sense of smell peaks at eight years old and subsequently decreases as aging occurs. However, variations have been reported: the Social Issues Research Centre contends that physical and mental acuteness are key factors in determining the decline in the sense of smell.
- Disorders such as schizophrenia and depression can lessen olfactory processes, as well as smoking. Scientists have found that supplements like zinc can help treat smelling disorders.
- The sense of smell is also connected to the ability to taste. The four tastes of sour, bitter, salty and sweet are enhanced by smells, contributing to a depth of taste that cannot be supplied by the tongue alone. This explains why it is difficult to taste food when your nose is congested.
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