People who add extra salt to their food at the table are at higher risk of dying early from any cause, according to a study. The research, involving more than 500,000 people, found that those who always add salt to their food have a 28% increased risk of dying prematurely compared with those who never or rarely add it. Generally, about three in every 100 people aged 40 to 69 die prematurely in the general population. Now, new calculations for the study, published in the European Heart Journal, suggest that one extra person in every 100 who add salt to their food may die young. The researchers …