The traditional blame placed on tryptophan for post-Thanksgiving dinner drowsiness appears to be largely misplaced. While turkey does contain this essential amino acid, many other common foods like eggs, cheese, fish, and various meats contain similar or higher levels of tryptophan. The real culprits behind the infamous "food coma" are more likely:

• The massive consumption of carbohydrates
• Large portion sizes leading to significant caloric intake
• Alcohol consumption
• The body's natural response to redirecting energy for digestion

Tryptophan does play important roles in the body:

• Acts as a precursor to serotonin (mood regulation)
• Supports cognitive function
• Contributes to immune system health through niacin production

Key Takeaways:

• Tryptophan alone isn't responsible for post-meal sleepiness
• The amino acid is found in many common foods besides turkey
• Overall meal composition and size have a greater impact on post-meal fatigue
• Consuming tryptophan through a balanced diet is preferable to supplementation

While tryptophan supplementation exists, it should be approached with caution due to potential risks like serotonin syndrome and medication interactions. The drowsiness experienced after Thanksgiving dinner is more likely the result of the combination of high-carbohydrate foods, portion sizes, and possibly alcohol consumption rather than turkey's tryptophan content alone.