People in England with type 2 diabetes will be offered the chance to try a soup-and-shake diet.
Studies show switching to the low-calorie liquid diet can put diabetes into remission.
Experts say they want to help people to be as fit as possible, particularly during the coronavirus pandemic.
Obesity and type 2 diabetes are linked and both increase the risk of complications from Covid-19.
Patients have already benefited from the year-long diet and exercise plan, which is why NHS England wants to expand the scheme.
Results from one trial showed almost half of those who went on the diet achieved remission of their type 2 diabetes after one year.