Food coma is a common term used to describe the drowsiness that happens after eating, especially after large meals or foods high in carbohydrates and fats. Many people experience it as a feeling of tiredness or the need to rest shortly after a meal.
This reaction is completely normal and part of the body’s natural digestive process. During digestion, blood flow increases to the digestive system to help absorb nutrients, which can temporarily lower energy levels in the brain and cause drowsiness. In healthy individuals, this doesn’t indicate any health problem.
The medical term for food coma is postprandial somnolence. It’s also sometimes called the “alkaline tide” or “donkey hour.” All these terms describe the same temporary state of fatigue and sleepiness that occurs after eating and usually goes away on its own.
Common symptoms
Symptoms are usually mild and short-lived, and may include:
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Drowsiness
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Heaviness
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Tiredness
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Fatigue
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Lack of motivation
These symptoms can make it harder to focus or stay active after eating, but they typically disappear on their own within a short time.
Why a food coma happens
Postprandial somnolence occurs mainly because, during digestion, blood flow increases to the digestive tract to help with nutrient absorption. As a result, less blood temporarily reaches the brain.
Large meals or foods that are high in fat take longer to digest and require more energy, which can make tiredness more noticeable.
In addition, the body’s neurohormonal response and activation of the vagus nerve also contribute to the feeling of fatigue after eating.
How long it lasts
The duration of food coma varies depending on the type and amount of food eaten, as well as individual factors. In most cases, the symptoms last between 30 minutes and 2 hours.
How to prevent a food coma
Tips that can help reduce drowsiness after eating include:
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Eat slowly and chew food well to improve digestion
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Have three main meals and two snacks per day instead of eating large portions at once
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Avoid skipping meals to prevent overeating later
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Drink coffee or caffeinated tea after meals to stimulate the nervous system and increase alertness
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Drink around 2 liters (8 cups) of water per day to support digestion
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Take a 10- to 15-minute walk after eating to boost circulation and energy
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Reduce the intake of large, fatty, or high-glycemic foods
Following these habits can help reduce the intensity of food coma and maintain energy levels after meals, allowing you to continue your daily activities without feeling sluggish.