Fat tissue is an important component of the endocrine system. As such, it helps with regulating hunger and food intake.
Adipocytes produce a hormone called leptin in response to their fat content. Therefore, the more fat cells are available in storage, the higher the leptin level will be.
Leptin communicates with the brain by binding with neuroreceptors. If the brain is receiving plenty of leptin, it will release neuropeptides that create the sensation of satiety. When fat reserves diminish, leptin levels drop. In the absence of leptin, the brain releases neuropeptides that stimulate the appetite.