Nearly 7,000 children and young adults under 25 years of age with type 2 diabetes in England and Wales – about 10 times the reported numbers, are according to Diabetes UK.
Its most widely found 2016-17 data analysis was being dealt with in surgeries rather than in specialist units.
The condition is associated with obesity and is more aggressive in children.
Child health experts said that the government should now take action to implement proposals to reduce obesity among children.
The Obesity Health Alliance said it was "extremely important" to see so many young people diagnosed with type 2 diabetes.
"We know that obesity contributes to this and other serious health conditions, and one in three children leave the primary school with too much pressure or obesity, these findings are worrying, but unfortunately, not a surprise, "said Caroline Cerny of the Alliance.
New figures from the latest National Diabetes Examination for 2016-2017 include information about cases of 2% 95% GP surgeries in England and Wales, as well as numbers and They were treated in specialist pediatric units.
It found that a total of 6,836 children and young people under the age of 25 were treated for the condition.
- 11 children five to nine years old
- 196 children 10 to 14 years old
- 1,246 people aged 15 to 19
- 5,383 between the ages of 20 and 24
But a previous report by the Royal College of Paediatrics and Child Health suggested that the figure was 715 – the number of children and young people looked after for type 2 diabetes of pediatric diabetes units in England and Wales.
These units provide specialist support for young people.
Some may be at risk that the condition will move rapidly, creating other health complications, such as blindness, estimates, heart disease and kidney failure.
GPs also provide lifestyle advice and support and many young people are treated in primary care.
Family history and ethnic background, as well as obesity, are factors among children and young people developing type 2 diabetes.
What is type 2 diabetes?
- It is a common condition that causes the level of sugar (glucose) in the blood to be too high
- I'm caused by chemical problems with the body (hormone) of the insulin name
- Type 2 diabetes can cause symptoms such as too much thirst, and they need a lot of tiredness
- It can also increase the risk of serious problems with the eyes, heart and nerves
- There is a lifetime condition that could mean a change in diet, medicine and regular checks
Bridget Turner, policy director and campaigns at Diabetes UK said: "Type 2 diabetes can be boring for children and young people.
"We need to encourage living healthy by providing clear and easy to understand nutrition information about the products we all buy, and protect children from advertisements for foods that are high in fat, salt and sugar. "
He said that children and young people with type 2 should have access to specialist treatment from trained healthcare professionals to control the condition.
& Lifestyle changes & # 39;
Professor Russell Viner, president of the Royal College of Paediatrics and Child Health, stated that these new figures emphasized the need to act.
"For many children, the development of type two diabetes with lifestyle changes, but this is not easy – they need support.
"That is why we were pleased to see the ambitious proposals set forth in chapter two of the Children Obesity Plan. We urge the government to maximize their impact by introducing them all and making it so fast . "
A spokesman for the Department of Health and Social Care said he was committed to halving children's obesity by 2030.
"We will be launching consultations to limit promotions in stores for sugar and fatty foods, as well as a 9pm ban on advertising.
"The long term NHS plan will stop its core and build on our current work to keep people healthy and well."