The Shocking Truth Behind Why You Feel Tired After Eating – Backed by Science!

Have you ever noticed that after a big meal, you feel sleepy and lethargic? You’re not alone. Many people experience this phenomenon, known as postprandial somnolence or “food coma.” In this article, we will explore the reasons why we feel tired and sleepy after eating, backed by scientific research.

Blood sugar levels

If we eat a large amount of carbohydrates, our blood sugar levels can spike too high.

One of the main reasons why we feel tired after eating is due to fluctuations in blood sugar levels. When we eat carbohydrates, our body breaks them down into glucose, which enters our bloodstream and causes our blood sugar levels to rise. This triggers the release of insulin, which helps to move glucose from our blood into our cells to be used as energy. However, if we eat a large amount of carbohydrates in one sitting, our blood sugar levels can spike too high, causing our body to release too much insulin. This can result in a rapid drop in blood sugar levels, leading to fatigue and drowsiness.


Another reason why we feel tired after eating is due to the energy required for digestion. Digestion is a complex process that involves breaking down food into smaller molecules that can be absorbed by our body. This process requires energy, which can leave us feeling tired and lethargic after a big meal.

Human Digestive System


Certain hormones, such as serotonin and melatonin, can also contribute to feeling tired after eating. Serotonin is a neurotransmitter that is involved in regulating mood and appetite. It is also a precursor to melatonin, a hormone that helps to regulate our sleep-wake cycle. When we eat foods that are high in tryptophan, an amino acid that is a precursor to serotonin, our body can convert it into serotonin and melatonin, leading to feelings of drowsiness and sleepiness.


In conclusion, feeling tired and sleepy after eating is a common phenomenon that can be attributed to fluctuations in blood sugar levels, the energy required for digestion, and the effects of certain hormones. By understanding these underlying factors, we can take steps to minimize the effects of postprandial somnolence and improve our overall energy levels.

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