Insulin is a critical hormone produced by the pancreas that regulates blood sugar levels in the body. After eating, insulin helps cells absorb glucose from the bloodstream, providing energy or storing it as fat. It plays a vital role in maintaining homeostasis in energy metabolism. Insulin also inhibits the production of glucose by the liver, ensuring that blood sugar levels remain within a healthy range. Additionally, insulin is essential for the uptake of amino acids and fatty acids, which are necessary for muscle growth and overall body function.