How Long Can the Human Nose Distinguish Smells?

Human olfactory receptors, though not as sensitive as other animals', can decipher many scents. Scientists study the demise of the human sense of smell and quantify when it occurs during our lifespans.

Identification

• 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.

Factors

• 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.

Sensory Connection

• 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.