People with psoriasis who are obese at 18 years of age have a higher risk of developing psoriatic arthritis.

Psoriatic arthritis is a type of arthritis that develops in the joints of 6 to 42 percent of people with psoriasis, a condition that causes itchy or sore patches of skin.
To study whether obesity increases the risk of psoriatic arthritis, researchers followed 943 psoriasis patients. Of those patients, 26.5 percent had psoriatic arthritis. Researchers examined predictors of psoriatic arthritis included body mass index (BMI, a ratio of weight to height) at age 18 years, younger age at psoriasis onset, being female, and having larger body surface areas affected by psoriasis.
The earliest onset of psoriatic arthritis occurred in obese and overweight participants. It was found that 20 percent of those who were overweight or obese at age 18 years developed psoriatic arthritis by age 35 years, while 20 percent of normal-weight patients developed psoriatic arthritis by age 48 years. Current BMI and family history of psoriasis were not significant predictors of psoriatic arthritis.
This study shows that obesity at 18 years of age in psoriasis patients increases their risk of developing psoriatic arthritis. Conversely, prevention and early treatment of obesity may lower the risk of developing psoriatic arthritis.
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