What Causes Food Coma? Unveiling the Culprits

Do you ever feel like taking a nap after a heavy meal? Do you feel drowsy and unable to concentrate after eating? If so, you may have experienced what is commonly known as a food coma. In this article, we will explore the causes of food comas and unveil the culprits behind this post-meal lethargy.

The Basics: What is a Food Coma?

A food coma, also known medically as postprandial somnolence, is a condition where an individual feels extreme drowsiness or sleepiness after a meal. This condition is not a disease, but rather a physiological response to the metabolism of food.

Most often, food coma is experienced after consuming a meal rich in carbohydrates and fats, usually in large quantities. Despite the name, a food coma is not related to alcohol intoxication, despite both sharing similar symptoms.

The Science Behind a Food Coma

After consuming a meal, the body redirects blood flow to the digestive system to aid in the breakdown of food. This results in a decrease in blood flow to the brain, which can affect cognitive function and lead to a feeling of sluggishness.

Additionally, the release of insulin after a carbohydrate-rich meal can cause an increase in the production of the amino acid tryptophan. Tryptophan is a precursor to serotonin, a neurotransmitter that contributes to feelings of relaxation and sleepiness.

Factors Contributing to a Food Coma

1. Portion Size

The amount of food consumed plays a significant role in post-meal lethargy. Consuming a large meal can overwhelm the digestive system, requiring more blood and energy to digest, diverting resources from other bodily functions like cognition and movement.

2. Type of Food

Carbohydrates and fats are more challenging for the body to break down than proteins. Eating a meal heavy in carbs and fats requires more energy to metabolize, contributing to the feeling of postprandial sluggishness.

3. Rate of Eating

Eating quickly can cause an influx of air to enter the digestive system, causing a feeling of discomfort, bloating, and sluggishness. Eating slowly and savoring each bite also allows the brain to register when the stomach is full, reducing the likelihood of overeating and the consequent food coma.

4. Timing of Meal

Eating a meal close to bedtime can also lead to feelings of sluggishness and lethargy. When the body is horizontal, blood pressure lowers, and digestion becomes slower, exacerbating the effects of postprandial sleepiness.

How to Combat a Food Coma?

While there is no cure for postprandial somnolence, there are things you can do to mitigate its effects, including:

  • Consuming smaller portions
  • Eating a balanced meal with a variety of nutrients
  • Eating slowly and with mindfulness
  • Remaining active after the meal with light exercise or taking a walk


In conclusion, a food coma is a natural physiological response to the metabolism of food, specifically carbohydrates and fats. The amount, type, and rate of eating, and timing of a meal can all contribute to postprandial somnolence. By following recommendations such as consuming smaller portions, eating mindfully, and remaining active after a meal, you can combat the effects of a food coma and improve your overall wellness.

List of Common Questions and Answers

  • Q: Can a food coma be dangerous?
  • A: No, a food coma is not dangerous and typically temporary, lasting only a few hours.
  • Q: What foods are most likely to cause a food coma?
  • A: Meals high in carbohydrates and fats are most likely to cause postprandial somnolence.
  • Q: Is a food coma the same as an afternoon slump?
  • A: While both involve drowsiness and fatigue, an afternoon slump is a feeling of lethargy and decreased productivity experienced typically in the afternoon, whereas a food coma occurs after a meal.
  • Q: How long does a food coma last?
  • A: A food coma typically lasts for a few hours after a meal, depending on the size and composition of the meal consumed.


  • “Postprandial Somnolence”. Harvard Health Publishing.
  • “What Causes Post-Meal Sleepiness?”. Cleveland Clinic.
  • “Why Do You Feel Sleepy After Eating?”. Healthline.
  • “Why Do People Get a ‘Food Coma’ After Eating?”. Live Science.

Leave a Reply

Your email address will not be published. Required fields are marked *