Why that post-Thanksgiving nap has nothing to do with the turkey you ate
In short: The belief that turkey induces sleepiness due to its tryptophan content is a persistent myth. While tryptophan is a precursor to sleep-regulating neurochemicals, the amount found in turkey is insufficient to cause drowsiness. The real culprit behind your holiday fatigue is the sheer volume of food consumed during the meal.
Tryptophan is an essential amino acid that the human body cannot produce on its own, meaning it must be obtained through diet. It is biologically significant because the body uses it to synthesize serotonin and melatonin, which are neurochemicals that regulate mood and sleep. Because of this connection, it is commonly assumed that consuming turkey—a known source of tryptophan—leads to sleepiness. However, this logic fails because the concentration of tryptophan in turkey is far too low to significantly influence the production of these hormones in the brain.
Furthermore, tryptophan is not unique to turkey; it is found in many other common foods, including chicken, fish, eggs, and dairy products. The actual cause of post-meal lethargy is the physical process of overeating. Consuming large portions of food forces the body to redirect blood flow toward the digestive tract to ensure an adequate supply of oxygen and hormones necessary for processing the meal. This redirection of blood away from the brain and muscles contributes to feelings of heaviness and fatigue.
The composition of a typical holiday feast further exacerbates these effects. Meals rich in carbohydrates and fats can cause blood sugar spikes followed by crashes, and may trigger the release of pro-inflammatory proteins known as cytokines, both of which contribute to exhaustion. These physiological responses are often compounded by the consumption of alcohol, a central nervous system depressant. For individuals with chronic conditions like hypertension or diabetes, these effects can be even more pronounced. Ultimately, the drowsiness experienced after a large dinner is a systemic reaction to overconsumption rather than a specific chemical response to the turkey itself.
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Sources
- Summary by Intellect · source: Does Eating Turkey Make You Drowsy
- Also: Does Eating Turkey Make You Sleepy? | Myth vs. Reality, Thanksgiving Day, Tryptophan, & Facts | Britannica
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