We know that just losing weight can reverse Type 2 diabetes.
But until now no one expected when you start losing weight is very crucial.
Now we know that before you lose weight, the better. Experts say you have to lose weight as soon as you are diagnosed if you want to beat the disease.
Having a strict 800-calorie diet within a few years after diagnosis is more likely to cure diabetes than to wait longer.
The reason is that Type 2 diabetes that is not controlled for more than three years can damage pancreatic cells that produce insulin that cannot be repaired.
A study by the University of Newcastle looked at data from 298 adults diagnosed with conditions about six years earlier.
The participants, aged between 20 and 65 years, only consumed 825 to 853 calories per day for three to five months before switching to a healthy diet.
Nearly half (46%) of them were free of Type 2 a year later, compared to only 4% who did not go on a diet.
Studies question why weight loss cures some patients but not others.
The scientists observed 40 who were in remission and 18 who still had the condition.
They found that even when these patients had lost the same amount of weight, some had experienced remission but some still had diabetes.
Patients undergoing remission show initial and continued improvement in the function of their beta cells, cells in the pancreas that produce insulin.
After losing weight, the beta cells of those in remission begin to function properly while they are not in those who still have type 2 diabetes.
This is where care becomes very important. On average, those who enter remission have lived with it for a shorter period of time than those who still have the disease.
"Our findings show that the longer a person has lived with Type 2 diabetes, the less likely their beta cell function is to increase," said lead author Professor Roy Taylor.
"The clinical message is clear: a new effective weight-loss approach should be recommended for all with Type 2 diabetes, especially at the time of diagnosis."
Dr. Elizabeth Robertson, director of research at Diabetes UK, said that we now know why some people can make their diabetes remission, while others cannot.
This is important news for one in 15 people in the UK who have developed this condition.