How too Much Cortisol can lead to Decreased Health and Increased Belly Fat
Some have called it the “master” of all hormones.  Others curse it for its ability to wreak havoc on our body’s fragile endocrine balance.  In spite of the mixed opinions one thing is certain: cortisol is a powerful hormone necessary for life.  But if its level is not optimal in your body, your health could suffer.
What is Cortisol?
The hormone cortisol is produced in the adrenal glands and is primarily responsible for regulating blood sugar, helping to metabolize fats, protein and carbohydrates and assisting in managing our stress response. We all have times of stress in our lives, and cortisol helps us to function during these times.
When the stress goes up, cortisol kicks in and delivers help.  We get a quick burst of energy, our memory sharpens, our immunity increases, and our sensitivity to pain decreases.  These are all important and natural functions of cortisol and ensure that we are able to weather the curve balls that life throws at us.
However, if the stress doesn’t let up, neither does the cortisol.  Unfortunately, what is healthy in small bursts becomes dangerous over the long term.  If you have persistent stress in your life, then you have cortisol levels that are out of balance:  your body makes so much cortisol that it detrimentally affects your health. This leads to adrenal fatigue.
When you have prolonged, high levels of cortisol in your bloodstream
you will crave foods that are high in carbs (like cake and cookies),
you will gain weight in your abdominal area (which increases your risk of heart disease and diabetes), and
you will have trouble sleeping
Cortisol and the Circadian Rhythm AsianJPharm_2011_5_1_1_80057_f3

Our bodies produce different chemicals during the day and night that control our sleep, energy and mood.  The natural rhythm of this cycle is known as the Circadian Rhythm, and cortisol is a key player.
Under normal circumstances, your body produces cortisol in amounts largely determined by the clock.  Levels tend to be higher in morning—triggered by the emerging daylight–giving you a boost of energy to jumpstart your day.
As the day wears on, cortisol levels should drop, helping to prepare you for a good night’s sleep. Likewise, Melatonin (another hormone that affects your energy and sleep habits) levels should be lower in the morning but as the daylight fades, they should increase, helping you to begin relaxing and preparing for sleep.
However, if you are under constant stress or if your adrenal glands are not functioning properly, your cortisol level may not drop off during the day. Instead, it may actually rise and stay at a dangerously high level.  By the time bedtime rolls around, you will not feel sleepy.  You will feel “tired but wired,” and be unable to relax and fall asleep.