Your body's natural internal clock, which operates on a roughly 24-hour cycle, regulates physical, mental, and behavioral changes, such as the sleep-wake cycle. It's primarily influenced by light and darkness and is controlled by a "master clock" in the brain called the suprachiasmatic nucleus (SCN).
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This internal clock synchronizes with the day-night cycle and affects other bodily processes, such as hormone release, including melatonin and insulin. It also regulates body temperature, digestion, and metabolism. Disruptions to this rhythm, often caused by factors like jet lag, shift work, or excessive screen time, can negatively impact overall health.
How it Works
• Internal Clock:
Your body has an internal biological clock, mainly located in the SCN within the hypothalamus of the brain.
• Light Cues:
The SCN is linked to your eyes and responds to changes in light.
• Signals to the Body:
When the eyes detect light, the SCN signals the body to become more alert, and the release of melatonin (a sleep-promoting hormone) is delayed.
• Hormonal Changes:
As light fades at night, the SCN signals the brain to release melatonin, and your body temperature begins to cool, preparing you for sleep.
• Widespread Influence:
This central clock sends signals that affect nearly all tissues and organs in the body, influencing processes beyond just sleep.
Factors that Influence Your Circadian Rhythm
• Light and Darkness: The most significant influence on your circadian rhythm.
• Meals: When and what you eat can affect your internal clock.
• Physical Activity: Your daily exercise routine plays a role.
• Stress: Emotional and physical stress can disrupt rhythms.
• Social Environment: Your social interactions and daily schedule matter.
Why It's Important
• Regulates Sleep-Wake Cycle: It determines when you feel awake and when you feel sleepy.
• Maintains Other Functions: It also influences hormone release, temperature regulation, metabolism, and digestion.
• Supports Overall Health: A healthy circadian rhythm is crucial for good physical and mental well-being.
What Happens When It's Disrupted
• Disruptions to your circadian rhythm can lead to sleep disorders.
• It can negatively affect overall health and increase the risk of health issues like depression, obesity, and diabetes.
Now we go to the video by Doctor Greger on how it affect weight gain and weight loss
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