Summary: Jim LaValle, clinical pharmacist and board certified clinical nutritionist and metabolic expert, author, “Cracking the Metabolic Code”. What you need to know about cortisol and your health. Cortisol is a hormone released during stress. It is involved with many body functions such as controlling blood sugar levels, blood pressure, regulating metabolism and regulating energy by selecting the right amount of nutrients for our body. When it’s released it increases heart rate, blood pressure, blood glucose