A link has been found between the skin condition psoriasis, type 2 diabetes and obesity, researchers have said.
The study has also shown that people with psoriasis are more likely to develop obesity and type 2 diabetes.
The research involved looking at medical data including height, weight, diagnoses of psoriasis and diabetes, lifestyle and environmental factors of around 33,500 Danish twins.
Among the nearly 460 individuals with type 2 diabetes, 7.6 per cent also had psoriasis; among those without type 2 diabetes, just 4.2 per cent had the skin condition.
Researchers also said that those with the skin condition weighed more than those without it.
The study, which was led by Dr Ann Sophie Lonnberg from the University of Copenhage, also showed that those who had psoriasis tended to have a higher body mass index.
Researchers think the link between psoriasis and obesity could partly be the result of a common genetic cause.
Dr Lonnberg said: “Psoriasis is a complex disorder. The genetic background for the disease and its many comorbidities (co-existing conditions) have not yet been fully uncovered.
“The reason psoriasis and obesity are associated is not only due to a common lifestyle, but they are also associated due to common genes. It is important to treat psoriasis and obesity and diabetes, since they are risk factors for heart disease and could have serious effects on overall health.”
Researchers have suggested the common link between the skin condition and obesity may be the result of a common genetic cause.
The study appears in the online journal JAMA.