Previous studies have linked a decrease in brain volume with type 2 diabetes in older people.
It was found that 51.5 per cent of deaths were the result of the four risk factors.
More than 44 million people around the world are living with Alzheimer's disease.
Australia is falling behind many European nations when it comes to the issue.
The study is one of the largest in the world to link type-2 with Parkinson’s.
The type 2 diabetes study has discovered a new way to cure the condition without surgery.
UK news outlets reported that the pensioner was suffering from dementia.
Researchers are warning countries to take drastic measures to stop obesity from putting strain on health systems around the world.
People with chronic conditions such as arthritis or diabetes experience more pain when they argue with their partner, the researchers found.