If you’ve heard the word tryptophan, it was
probably around Thanksgiving or Christmas conversations – times when
many Americans go hog-wild for turkey. The context is usually
around the common post-feast sleepiness. You may be surprised to find
that many things you thought were true about tryptophan could be wrong. Here
are some facts and tips about tryptophan that are not only useful to
your health knowledge but will also be great information you can share as
conversation starters at holiday gatherings.
What is tryptophan?
Tryptophan is one
of many essential amino acids. For most of us, that begs
the question, what is an amino acid? Amino acid is a compound that
combines to form proteins. Amino acids and proteins together are
considered the building blocks of life.
Important stuff, right? Indeed: Infants require tryptophan for normal, healthy growth. Adults
benefit from its nitrogen balancing properties.
Even more important to note is the term essential
amino acid. Essential means that it is a type of amino acid that our
body does not produce by itself. The only way we get it is from our
diets.
Does tryptophan cause
sleepiness and fatigue?
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| Does tryptophan cause sleepiness? |
But does it cause sleepiness? Not
necessarily. The sleepiness you feel after gorging yourself on a
massive holiday feast is more likely the result of "feast-induced
drowsiness" – the result of consuming any heavy meal that is rich in
carbohydrate.
When we gorge ourselves, our bodies rightly
focus on digestion to deal with the overload, which focuses blood into the
digestive organs. So the inclination to snooze after eating a large feast
is our body’s way of shutting down bodily processes so that it can focus its
attention on digestion.
What does tryptophan do
then?
The amino acid tryptophan helps you
regulate your sleep and wake cycles, and can elevate your mood.
Many people have found that increasing their intake of tryptophan has helped
reduce problems with anxiety, impulsiveness, problems with concentration,
weight gain, carbohydrate cravings, and depression.
Any tryptophan downsides? If you are eating foods that contain tryptophan, no. It was once believed that tryptophan could have some dangerous sideeffects, based on some early studies. As a result, tryptophan was
removed from the supplementation market. However, no subsequent studies
have shown any negative side effects from eating too much turkey. So there is no
such thing as tripping out on tryptophan! Have as much as you want.
Turkey is the best source
of tryptophan, right?
Actually, no. Turkey is one source
of tryptophan – a good one – but it is not the only source and
not even the food with the most of it.
You can boost your tryptophan level by
consuming foods with protein; nearly all foods with protein naturally contain
some tryptophan, although often in small amounts relative to the other
essential amino acids.
Particularly good sources of tryptophan include:
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| Turkey is a good source of tryptophan, but there are other sources too! |
- Chicken
- Legumes
- Red meats
- Cheese
- Nuts
- Peanuts and peanut butter
- Pumpkin seeds
- Sesame seeds
- Dairy products
- Tuna
- Shellfish
- Soybeans
- Tofu
- And, yes: turkey
But should you want a serious boost of tryptophan,
start with the top item on the above list: chicken. In the
average serving of chicken, you get nearly 130 percent of the daily recommended
intake of tryptophan; that's about 11 percentage points more tryptophan per
serving than you will find in turkey. Turkey provides 118.7
percent of the daily recommended intake of tryptophan. Therefore, it is certainly correct to say that turkey is a good
tryptophan source too, as is any poultry food. But start with
chicken to really “beef up” on this essential amino acid.
Learn more about
tryptophan sources and side effects
If this article has whetted your appetite for
more information on tryptophan, and how you can benefit from it, check
out these resources:
- Get the low-down on tryptophan from the National Institutes of Health (NIH) Medline Plus website.
- Get more in-depth information on tryptophan at the nonprofit The World's Healthiest Foods web page, dedicated to tryptophan.
- Web MD's article The Truth about Tryptophan reveals the truth behind the long-held assumptions of tryptophan causing tiredness or drowsiness.
Now that you know the positive benefits of tryptophan,
why not put some more of it in your diet? To help you get started, click here
for a selection of recipes for turkey. Or to keep that tryptophan
coming, check out these turkey leftovers recipes.
Ric Moxley
Contributing Writer






