According to the Survey, suggest that Dementia is the most common forms of Alzheimer's disease and is an age-related mental condition, s the art by the loss of memory and summarize with rapid and apparently senseless mood swings and unnecessary violent behavior. Over the years, scientists have studied the disease thoroughly and have often found signs other than loss of memory that can signal the onset of dementia. A new study, conducted by researchers at University of Chicago in the US, has found that loss of the sense of smell is one of those unfortunate signs.

According to the study, older adults who have trouble identifying common odours are more than twice as likely as those with a normal sense of smell to develop dementia within five years. Researchers conducted a long-term study of nearly 3,000 adults, aged 57 to 85 years. They found that those who could not identify at least four out of five common odours – peppermint, fish, orange, rose and leather – were more than twice as likely to develop dementia within five years. The team found that although 78 percent of those tested were normal – correctly identifying at least four out of five scents – about 14 percent could name just three out of five.

Five per cent could identify only two scents, two percent could name just one, and one per cent of the participants were not able to identify a single smell.

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