Excess fat, white or brown, can have several different effects on the body.
The one we tend to focus on, or ignore depending on your view on your health versus what you like, is glucose regulation. But did you know that leptin, and TNF-α are adipokines? I know brainy stuff, but these two molecules are involved in the inflammatory process. Leptin tells the brain that the body has enough energy stored in the body, and TNF-α is responsible for the immune response to make inflammation.