The #FoodUpfront campaign calls for the public to be given clear nutritional information in restaurants, cafes and takeaways, as well as on the front of all pre-packaged food and drinks.
Ms Griffith, who pledged her support at a parliamentary event hosted by Diabetes UK, said: “I was horrified to discover just how many calories there are in common ready meals and favourite choices for meals out.
“All of us, but especially people with diabetes, need to know how many calories and how much fat and sugar we are eating. Food labelling must be clear and unambiguous so that consumers know exactly what they are buying, and it should never be the case that the packaging deliberately misleads people.
“At present, companies don’t have to provide any information on the front of their goods, and one in three products in shops don’t have clear traffic-light labels for nutritional information. Many restaurants, cafes and takeaways also still do not provide calorie labelling on their menus.
“This needs to change. That’s why I’m supporting the #FoodUpfront campaign to make clear and consistent labelling compulsory on menus and the front of packaged products.”
Helen Dickens, Assistant Director of Campaigns and Mobilisation at Diabetes UK, said: “We know that consistent and clear food labelling can help all of us to make informed choices.
“For people with diabetes, easy access to clear and consistent labelling, for example on carbohydrate content, is vital to supporting them with their diabetes management.
“With around two-thirds of adults, and almost a third of children in the UK classed as overweight or obese, and therefore at increased risk of Type 2 diabetes and other chronic health conditions, it’s really important that we have measures in place that help make it easier for all of us to know what’s in the food we’re buying.
“That’s why we are calling for the government to strengthen and, when possible, introduce mandatory front of pack traffic-light labelling on packaging, and calorie labelling on menus. The British public overwhelmingly support these moves, so we are grateful to Nia Griffith MP for her efforts in helping put these potentially life-changing measures into practice.”