In general, people with the gene variant who also consumed the highest fat diets were seven times more likely to develop Alzheimer's than individuals with the susceptibility mutation who ate less fat.

BBC: High fat diet link to Alzheimer's

The researchers found that men with the highest tibia lead level were 2.7 times more likely to develop a cataract than those who recorded the lowest level of lead in this bone.

BBC: NEWS | Health | Lead exposure link to cataracts

Those with HIV are 100 times more likely to develop TB than other members of the population.

BBC: TB: The killer returns

But having reached the last four at Flushing Meadows last year, and at Wimbledon this summer, both times with Huber, he is continuing to develop as a doubles player on the world stage.

BBC: Murray & Huber lose doubles final

Prostate cancer research director John Masters, professor of experimental pathology at University College, London, said that men of Afro-Caribbean descent are three times more likely to develop prostate cancer than the average male, while those with a father or son who has had the disease is twice as likely to be diagnosed.

BBC: NEWS | Health | 'I got fit to fight terminal cancer'

There is a strong genetic link - a baby is 30-40 times more likely to develop cleft lip and palate if their elder brother or sister was also born with the condition.

BBC: Folic acid 'cuts cleft palate risk'