Definition: Hormones are hormones produced by the body to regulate various bodily functions. Hormones are chemicals that are released from glands in the body and help maintain homeostasis, or balance, within the body. In simpler terms, a hormone is like a special chemical signal sent out to our bodies to tell them what to do. When we eat something, our digestive system produces hormones like insulin, which helps regulate blood sugar levels and helps us feel full. Hormones also help us sleep, fight infections