The NHS National Diabetes Audit says a high proportion of women aged between 15 and 30 are skipping insulin injections to lose weight.
Now a charity wants diabulimia, as it is known, officially recognised as a mental health condition.
Diabulimia is when diabetics deliberately restrict their insulin for weight loss. Leading doctors and psychiatrists say diabulimia is most common with young women who have type 1 diabetes.
Type 1 diabetes is when the body doesn't make its own insulin and is unable to control how much sugar we have in our blood.