How does insulin promote muscle growth?
Oh boy, I’m long winded enough and love throwing out big words and this is a perfect opportunity to do so. But I will save you a headache and just stick to the basic facts! Like Dragnet “just the facts ma’am”! Insulin is a peptide hormone that is released from the beta cells of the pancreas. It is released due to a rise in blood sugar levels in the body that is induced mainly by eating carbohydrates, but to a lesser degree by some amino acids in protein sources (namely the BCAA’s). Insulin is primarily responsible for the direction of energy metabolism after eating. Insulin helps regulate blood sugar levels and helps keep them in the range of 75-120 mg/dl. Insulin binds to specific receptors in cell membranes and helps drive glucose into the cell. Insulin also helps activate glycogen synthase — which helps make glycogen to be stored in muscle tissue (2/3 of glycogen is stored in muscle tissue while 1/3 is stored in the liver). What many people don’t know is that insulin supports amino