However, simple smell tests offer an incomplete picture, monitoring the sense of smell only after it is detected by the brain.
In recent years, researchers have touted more advanced smell tests to predict dementia, with Canadian scientists making promising findings last month.
For both studies the researchers used a well-validated tool known as 'Sniffin'Stick' which looks like a felt-tip pen infused with distinct scents.
The participants smell each item and then identify that odour, one at a time, from a set of four choices.
And nearly 80 per cent of those who provided just one or two correct answers also had it, researchers wrote in the Journal of the American Geriatrics Society.
Overall, the degree of smell loss and incidence of the disease were significantly linked, lead author Professor Jayant Pinto found.
This combined business is the largest and most experienced motor trimming centre in NSW.
With the vast experience of the two companies combined and with more experienced tradesmen than any other organisation in the industry, we are able to give you a faster turnaround, whilst still producing high quality work at competitive prices.
'This is a bi-product of an industry that is driven by meat eating.'It will last me for several years where as the burger that you might eat today will have more of an impact than this and it will last for two hours.' And the ferocious debate between the two became more personal on social media.
Morgan tweeted: 'Poor George, came on to argue we should all be vegans - wearing a leather watch and shoes.'Monbiot replied: 'Poor Piers, can't see the difference between a watch strap that last two years and a burger that lasts, to judge by his girth, two minutes.'And the Good Morning Britain host hit back with: 'Erm, don't they both involve the slaughter of cows?
In the US, the devastating disease, which is currently incurable, affects more than five million, while 850,000 suffer in the UK.
Welcome to Sydney Motor Trimmers, established in 1997 & Clifford Powell Motor Trimmers, established in 1891.
He said: 'Loss of the sense of smell is a strong signal that something has gone wrong and significant damage has been done.