A study of more than 70,000 elderly Britons found that those who ate the most ultra-processed junk food were 43 per cent more likely to develop dementia than those who ate the least.A study of more than 70,000 elderly Britons found that those who ate the most ultra-processed junk food were 43 per cent more likely to develop dementia than those who ate the least.Read MoreHealth News | Mail Online