After performing a study of the elderly people, scientists found that the elderly who are lonely in their old age have higher chances of developing Alzheimer's disease than those who lead more active social lives.

It is still impossible to say whether loneliness contributes to the earlier onset of the disease or is an early symptom but there is a big possibility that social interactions may help in keeping Alzheimer's at bay.

Humans are social creatures who need interactions with each other. Researchers suggest that lonely people may be more vulnerable.

The study included 823 people who showed no signs of dementia and asked them to rate their level of loneliness on a five-point scale. They were also measured how often they received visitors. Study participants had annual mental check-ups for the following four years.

During this time, 76 of the participants developed Alzheimer's disease.
Those who score the most on the loneliness scale were two times more likely to develop Alzheimer’s disease than those with a low loneliness score.

It is quite possible that being active protects the brain against the early onset of the disease, although loneliness could be an early manifestation of the symptoms.