Post-Meal Sleepiness Not Just from White Rice, Korean Doctor Warns

Many people experience a strong urge to sleep after eating, a phenomenon often referred to as 'food sleepiness' or, in South Korea, 'sikgonjeung' (식곤증). Dr. Lee Dong-hwan, a popular South Korean physician with over a million subscribers on his YouTube channel, explains that this is a normal physiological response.

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Most people feel sleepy after eating because blood flows to the gastrointestinal tract, not the brain. This is a normal physiological state.

Dr. Lee clarifies that the sleepiness arises because a significant amount of blood is directed towards the gastrointestinal tract to aid in digestion. This increased blood flow to the gut means less blood is available for the brain, leading to feelings of fatigue. He notes that this sensation is often most pronounced in the afternoon, coinciding with the body's natural circadian rhythm, which tends to lower energy levels during that period.

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If the degree of sleepiness after meals is so severe that it affects daily life, you should go to the hospital to check if it is caused by the following potential diseases.

While generally harmless, Dr. Lee warns that if post-meal sleepiness severely impacts daily life, it could signal underlying medical conditions. Potential culprits include liver diseases such as severe fatty liver or hepatitis, anemia, thyroid disorders (both hyperthyroidism and hypothyroidism), and chronic inflammatory conditions like rheumatoid or autoimmune diseases. Digestive system issues and nervous system imbalances can also contribute.

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Having breakfast can prevent overeating at noon (binge eating), which greatly increases the chance of post-meal sleepiness.

For those experiencing typical post-meal drowsiness without an underlying illness, Dr. Lee offers three practical tips. First, eating breakfast can prevent overeating at lunch, a common trigger for intense sleepiness. Second, engaging in light physical activity, such as a post-meal walk in the sun, can improve sleep quality at night and reduce daytime fatigue. Finally, he recommends short 10-15 minute power naps during the lunch break to refresh the body and mind for the rest of the afternoon.

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If you really want to sleep, take a short nap of 10 to 15 minutes during your lunch break. This short sleep can effectively eliminate afternoon drowsiness and re-energize the body and brain.