Adipose tissue is part of the endocrine system. This plays a role in hormone production in the body, like sex hormones. Excess fat increases hormone production but in the obese, these hormones act like kudzu on the body. Like. They just spread & influence many secondary sexual expressions, like man tits & chick beards.  I'm not  medical professional but I do write a lot about health & fitness. So I might not be 100% right Anyway. Glands in the brain trigger hormone releases that cause the body to change. Excess fat produces hormones, too, which aren't supposed to be there. That's why you see gynomasticism in men & excess facial hair (beyond peach fuzz) in women.  It's like. The fat just says "I'm not sure what this creature is but I'll just release shit & let it figure out it's own final form"