Every week 4,500 people are diagnosed with diabetes across the UK, a charity has said.
Diabetes UK said that in the last year 235,000 people have been diagnosed with the condition.
The figures, released to mark Diabetes Week, highlight the scale of the "crisis" surrounding the illness, charity chief executive Chris Askew said.
He warned that many people are not aware of the seriousness of the condition.
"This Diabetes Week we are setting the record straight and focusing on the realities of living with the condition," said Mr Askew.
"There is still a lack of understanding when it comes to people being aware of the seriousness of diabetes and this worries us at Diabetes UK.
"There are over four million people living with the condition in the UK. The fact that 4,500 people will discover they have diabetes over the next seven days is deeply concerning, and highlights the current scale of the crisis.
"Diabetes Week is a time to share our concerns about the scale and seriousness of diabetes, but it is also a fantastic opportunity to highlight that with the right healthcare, support and management, diabetes doesn't have to hold anyone back."
Diabetes is a condition where there is too much glucose in the blood because the body cannot use it properly. There are two forms of the condition - Type 1 diabetes occurs when the body cannot produce insulin. Around one in 10 people with diabetes have Type 1 and it usually affects children or young adults.
Type 2 diabetes occurs when the body does not produce enough insulin or the insulin produced does not work properly. Type 2 diabetes is linked to lifestyle factors such as being overweight.
If diabetes is not properly managed it can lead to serious consequences such as sight loss, limb amputation, kidney failure and stroke.