The liver is a vital metabolic hub, operating on a 24-hour circadian rhythm. It plays a role in detoxification, protein production, and metabolic support. These functions vary in intensity throughout the day. Disrupting this rhythm can impair liver function, eventually leading to fatty liver disease and insulin resistance.

The liver's internal biological clock is synchronized with the brain's circadian rhythm, both responding to environmental cues like light and food intake. The body produces more bile during the day, when you eat. The liver boosts glucose production in the early morning hours and accelerates detoxification during rest. Crucially, this organ primarily repairs and regenerates cells during sleep. Therefore, the habit of staying up late hinders this repair and regeneration process, preventing the liver from resting, disrupting its natural circadian rhythm, and significantly increasing the risk of damage.

**Increased Fat Accumulation:** Staying up and eating late forces the liver to process and store energy, contributing to fatty liver disease.

**Impaired Detoxification Function:** The liver continuously metabolizes and eliminates toxins, but its efficiency is influenced by the circadian rhythm. When this rhythm is disrupted, metabolic and detoxification cycles become disordered, causing toxins to remain in the blood longer and gradually impairing the liver's detoxification function.

**Inflammation and Oxidative Stress:** When the liver is forced to operate against its natural circadian rhythm, liver cells easily become stressed. This overloaded state promotes the production of reactive oxygen species (ROS), causing oxidative stress, triggering inflammatory responses, damaging liver cell structures, and increasing the long-term risk of liver damage.

**Insulin Resistance:** Circadian rhythm disruption affects how the liver processes glucose, which can lead to type 2 diabetes—a major risk factor for fatty liver disease.

Individuals should maintain their liver's circadian rhythm by eating meals at regular times, finishing dinner before 8 PM, and avoiding overeating to reduce pressure on the liver. Additionally, it is essential to get 7-8 hours of sleep daily, going to bed and waking up at fixed times each day, including weekends.

In the evening, light activities such as walking, meditation, or yoga can promote relaxation and better sleep. Exposure to natural light during the day also helps synchronize the biological clock, benefiting liver function.

Anh Chi (Based on reports from ETimes, WebMD)