Eating sausages and other “ultra processed foods” could increase the risk of early death by 60 per cent, research suggests.

Two studies, published in the BMJ, link ready meals and other foods containing high levels of added fat and sugar to an increased risk of heart disease and stroke.

The research found that those eating four portions a day of such foods had a 62 per cent increased mortality risk, compared with those consuming less than two servings daily.

Each serving increased the risk of early death by almost a fifth.

Scientists said millions of people should change their diets, cutting out processed meats and convenience meals, in favour of more natural fare.

And they warned that modern lifestyles meant up to 60 per cent of daily energy intake was now coming from factory-produced foods.