“This is an emerging epidemic,” said Orit Pinhas-Hamiel, MD, director of the Pediatric Endocrinology and Diabetes Unit at Sheba Medical Center in Ramat Gan, Israel, at the annual meeting of the European Association for the Study of Diabetes, noting that these young patients, most with obesity, exhibit a significantly higher incidence of complications than adults with type 2 diabetes or young people with type 1 diabetes.
In 2017-2018, the incidence of type 2 diabetes among patients aged 15-19 years (19.7 per 100,000) surpassed that of type 1 diabetes (14.6 per 100,000), according to data from the United States.
“This is the first time that the incidence of type 2 diabetes has exceeded that of type 1 among youth,” said Pinhas-Hamiel. A review of 2021 published a few months ago highlighted this surge, with countries like China, India, the United States, Brazil, and Mexico leading the way.
SEARCH and TODAY
The SEARCH for Diabetes in Youth study, which was launched in 2000, is a multicenter observational study in the United States aimed at estimating the prevalence, incidence, and complications of types 1 and 2 diabetes among young patients. The Treatment Options for Type 2 Diabetes in Adolescents and Youth (TODAY) study is an interventional study focusing on adolescents with type 2 diabetes to evaluate the effectiveness of various treatment options.
“Diabesity” — the dual global epidemic of obesity and type 2 diabetes — has visible consequences from the moment of diagnosis, including hypertension. In the TODAY study, 11.6% adolescents had hypertension at diagnosis. A study conducted in Hong Kong involving 391 children younger than 18 years revealed that 22.5% had hypertension. In SEARCH, 27% young patients diagnosed with type 2 diabetes for 1.5 years had hypertension.
In addition, the SEARCH study found that 27% young individuals had low levels of high-density lipoprotein cholesterol, while 25% had high triglyceride levels, at 1.5 years after diagnosis.
Overall, the cumulative incidence of long-term diabetic complications was assessed in 500 adolescents participating in TODAY (mean age, 26.4 ± 2.8 years; mean time since diagnosis, 13.3 ± 1.8 years). The initial prevalence was 19.2%, while the cumulative incidence rose to 67.5% after 15 years of follow-up.
For dyslipidemia, the initial prevalence was 20.8%, with a cumulative incidence of 51.6%. The incidence of diabetic nephropathy was 54.8% and neuropathies was 32.4%. The prevalence of retinopathy was 13.7% for the period 2010-2011 and 51% for 2017-2018.
At least one complication was observed in 60.1% participants and at least two in 28.4%. As expected, risk factors for developing complications included belonging to a racial or ethnic minority, hyperglycemia, hypertension, and dyslipidemia.
“Among those who developed type 2 diabetes in adolescence, the risk for complications, including microvascular complications, has continuously increased and affected most participants in young adulthood,” said Pinhas-Hamiel.
At the same time, the rate of treatment with lipid-lowering and antihypertensive medications remains low among young people with type 2 diabetes. The management of dyslipidemia is suboptimal, with only 5% young patients with diabetes and dyslipidemia receiving appropriate medications. Furthermore, treatment adherence is lacking. In the TODAY cohort, for example, only one third of participants with high levels of low-density lipoprotein cholesterol were on lipid-lowering medications, and only half of the young patients with hypertension were taking antihypertensives.