Final answer:
Excess cortisol can result in high blood glucose levels, which is linked to Cushing's syndrome, and can also weaken the immune system and increase blood pressure.
Step-by-step explanation:
Excess cortisol in the body can lead to several adverse effects, one of which includes high blood glucose levels. Cortisol, a hormone released by the adrenal glands in response to stress, is involved in a wide range of physiological processes, including the regulation of metabolism. When cortisol levels are high, it can lead to Cushing's syndrome, a condition characterized by hyperglycemia (high blood sugar), among other symptoms such as central obesity, fatigue, and muscle weakness. Prolonged exposure to high levels of cortisol can also weaken the immune system, increase blood pressure, and exacerbate conditions like depression and osteoporosis.