Weight
People who are overweight are twice as likely to get an outbreak than people with a healthy BMI (body mass index). Obesity causes deposition of fats in the body that causes skin creases and folds. Psoriasis plaques often develop in these skin areas.
Being overweight also doubles the risk of other metabolic conditions such as diabetes and ischemic heart diseases – that, in turn, can cause flare-ups of psoriasis.