Insulin plays a critical role in the body by regulating blood sugar levels. It is a hormone produced by the pancreas that facilitates the uptake of glucose into cells, where it can be used for energy or stored as glycogen. This regulation is crucial not only for maintaining energy balance but also for preventing conditions like diabetes. When the body becomes resistant to insulin or fails to produce enough, it can lead to elevated blood sugar levels, causing serious health issues. Insulin’s role extends to fat metabolism and protein synthesis as well.