Action on Sugar has been set up by the team behind Consensus Action on Salt and Health (Cash), which has pushed for cuts to salt intake since the 1990s.
The new group aims to help people avoid “hidden sugars” and get manufacturers to reduce the ingredient over time.
It believes a 20% to 30% reduction in three to five years is within reach.
Like Cash, Action on Sugar will set targets for the food industry to add less sugar bit by bit so that consumers do not notice the difference in taste.
It says the reduction could reverse or halt the obesity epidemic and would have a significant impact in reducing chronic disease in a way that “is practical, will work and will cost very little”.
The group listed flavoured water, sports drinks, yoghurts, ketchup, ready meals and even bread as just a few everyday foods that contain large amounts of sugar.
A favourite tactic of Cash has been to name and shame products with large quantities of salt.
Action on Sugar chairman Graham MacGregor, who is professor of cardiovascular medicine at the Wolfson Institute of Preventive Medicine and set up Cash in 1996, said: “We must now tackle the obesity epidemic both in the UK and worldwide.
“This is a simple plan which gives a level playing field to the food industry, and must be adopted by the Department of Health to reduce the completely unnecessary and very large amounts of sugar the food and soft drink industry is currently adding to our foods.”
Dr Aseem Malhotra, a cardiologist and science director of Action on Sugar, said: “Added sugar has no nutritional value whatsoever and causes no feeling of satiety.
“Aside from being a major cause of obesity, there is increasing evidence that added sugar increases the risk of developing type 2 diabetes, metabolic syndrome and fatty liver.”