From the article:
In both cell culture and animal models, the researchers have shown that fat-derived leptin directly activates aldosterone synthase expression in the adrenal glands, resulting in production of more of the steroid hormone aldosterone.
High aldosterone levels are known to contribute to widespread inflammation, blood vessel stiffness and scarring, enlargement and stiffness of the heart, impaired insulin sensitivity and more.
Aldosterone, which is produced by the adrenal gland, has a direct effect on blood pressure by regulating salt-water balance in the body. High levels of aldosterone are an obesity hallmark and a leading cause of metabolic and cardiovascular problems. But exactly how it gets high in obesity was a mystery.