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Every year, families sit around the Thanksgiving table and joke about the “post-turkey coma.” The idea that turkey makes you sleepy has become a holiday tradition in itself.
But Dr. J recently shared a theory that turns this familiar story completely upside down:
“When families fight at Thanksgiving, I wonder if it’s not just the stress of gathering… maybe it’s the turkey.”
At first glance, it sounds surprising. But the science behind it is compelling, and for some people, it explains far more than a little post-dinner fatigue.
The Truth About Tryptophan: Sleepy for Some, Irritable for Others
Turkey is rich in tryptophan, an amino acid commonly associated with relaxation and sleep.
But this pathway only holds true for people whose genetics allow tryptophan to be converted into serotonin and melatonin.
For others, especially individuals with TPH gene variants, tryptophan takes a completely different biochemical path, one that leads to irritability, aggression, emotional overwhelm, and even physical discomfort.
Dr. J knows this firsthand. She carries three TPH2 variants, and she can feel the effects almost immediately when she eats tryptophan-rich foods.
Her words say it best:
“I get real irritable and emotional. I can tell right away.”
The Perfect Storm on a Thanksgiving Table
Consider the typical holiday meal:
- Turkey
- Wine
- Cheese plate
- Chocolate dessert
All of these foods are high in tryptophan. When you have multiple family members with TPH variants loading up on all four, you create the biochemical conditions for elevated quinolinic acid, a neurotoxic compound linked to emotional volatility, irritability, and aggression.
In other words, the holiday tension might not be personal. It might be biochemistry.
What You’ll Learn in the Full Q&A
Dr. J’s educational breakdown explores:
- The two pathways tryptophan can take inside the body
- Why TPH gene variants dramatically alter tryptophan metabolism
- The link between tryptophan and quinolinic acid
- How TPH variants contribute to mood shifts and physical symptoms
- Dr. J’s personal experience living with three TPH2 variants
- Why families may clash more after tryptophan-heavy meals
- Foods high in tryptophan (far beyond turkey)
- How to check your Serotonin & Tryptophan slider
- Whether you truly need to avoid tryptophan and why the answer is usually no
Dr. J’s Personal Story
In the video, Dr. J openly shares her own genetic profile, including the three TPH2 variants that influence both her mood and her physical traits.
She even points out physical markers often associated with TPH variants, including the slight curvature of her pinky fingers and other subtle joint differences.
But the most powerful insight she offers is emotional, not physical:
“It wasn’t me. It was my physiology going haywire.”
This understanding has allowed her to approach her reactions with compassion instead of self-judgment. It has also helped her make practical lifestyle adjustments, such as choosing Cornish game hen instead of turkey during the holidays.
Foods Highest in Tryptophan
Tryptophan is found in more foods than most people realize. Common sources include:
- Turkey
- Wine
- Chocolate
- Hard cheeses (Parmesan, Swiss, Romano)
- Spinach
- Soybeans
- Chia and sesame seeds
During a holiday meal, most of these appear on the table simultaneously, creating a high tryptophan load that can overwhelm individuals with TPH variants.
Symptoms Associated With TPH Variants
Mental & Emotional Symptoms
- Irritability after eating tryptophan
- Aggressive or impulsive behavior
- ADHD-like symptoms
- Anxiety, OCD tendencies
- Depression
- Emotional overwhelm
Physical Symptoms
- Curved or crooked finger joints, especially pinky
- Joint contracture in elbows or finger joints
- Fallen arches
- Joint pain or laxity
- Difficulty maintaining chiropractic adjustments
- Ulnar drift in fingers
These variations often run in families, which is why multiple relatives may react similarly to holiday meals, and why holiday tension can feel so predictable.
The Empowering Message Behind the Genetics
Understanding your TPH genes is not about restriction, judgment, or labeling yourself.
It’s about recognizing that your body may be reacting to a biochemical sequence, not a personal failing.
You are not “too sensitive.”
You are not “overreacting.”
You are not “difficult.”
You are responding to your unique physiology.
Once you understand this, you can make food choices that support your mood and wellbeing, rather than working against your biology.
Check Your MyHappyGenes® Report
If you’ve already run your MyHappyGenes® test, log in to your report and look at your Serotonin & Tryptophan slider.
- A score above 30% indicates that tryptophan may strongly affect your physiology.
- Dr. J’s personal score is 44%, which aligns with her noticeable reactions.
The Good News: You’re Not Stuck With These Reactions
With the right co-factors, nutritional support, and lifestyle strategies, individuals with TPH variants can improve their tolerance to tryptophan.
Most people do not need to eliminate tryptophan entirely. They simply need to support their biochemistry properly.
This Thanksgiving, Notice the Signals
As you sit down to dinner, pay attention to what your body tells you afterward:
- Does your mood shift?
- Do you feel calm or irritable?
- Do your joints ache?
- Do you feel overwhelmed instead of relaxed?
- Do you feel sleepy or wired?
Your body communicates constantly.
Your genes help explain why.
And once you understand the science behind your reactions, you gain the power to support yourself with clarity and compassion.
