This is a chemical called 'cortisol' which is a chemical that is continually secreted throughout the day by the adrenal glands. These are triangular-shaped, and they sit on top of the kidneys. Cortisol secretion follows a 24 hour, or circadian rhythm, with peak levels occurring in the morning (from about 6.00am-8.00 am) and the lowest levels are at about midnight. There are many factors that influence cortisol levels including fasting, exercise, and anxiety.
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