10 Jul 2017 --- In an attempt to help people make healthier choices about their food, academics at Birmingham City University have proposed a new traffic light system which uses till receipts to evaluate the nutritional content of a consumer’s entire supermarket trolley. The system shows the total data for calories, sugar, fat and salt in a person’s shopping basket and highlights the total in a green, amber or red color. Although the proposal has been labeled by some as “nannying,” the researchers say that it could revolutionize the way we buy food.