Why do humans have melatonin?

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Dr. Michael Roizen, MD
Internal Medicine
Melatonin evolved for us to sense light and dark, as well as changes in season, because our circadian rhythms help regulate our reproductive rhythms. Originally, nature tried to schedule the occurrence of births at a time of year when the odds of survival for mother and baby were the greatest—that is, when the days are long and the nights are short (and the food supply is the greatest). So melatonin cycles meant more babies were conceived to be born in spring.
You: Staying Young: The Owner's Manual for Extending Your Warranty

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You: Staying Young: The Owner's Manual for Extending Your Warranty

From the Authors of the #1 Bestselling YOU: On A Diet and YOU: On a WalkWouldn't you like to know how to prevent your body from aging badly? Most of us believe that at age 40 or so, we begin the slow...

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Endocrine System

Your endocrine system works with your nervous system to control important bodily functions. The endocrine systems responsibilities include regulating growth, sexual development and function, metabolism and mood. The endocrine syst...

em also helps give your body the energy it needs to function properly. Endocrine glands secrete hormones into the bloodstream. Hormones are considered chemical messengers, coordinating your body by transferring information from one set of cells to another. Your endocrine system health can be affected by hormone imbalances resulting from impaired glands. A hormone imbalance can cause problems with bodily growth, sexual development, metabolism and other bodily functions. Endocrine system diseases or conditions include diabetes, growth disorders and osteoporosis.
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Important: This content reflects information from various individuals and organizations and may offer alternative or opposing points of view. It should not be used for medical advice, diagnosis or treatment. As always, you should consult with your healthcare provider about your specific health needs.