Question Your World: Thanksgiving Priceless Science

Happy Thanksgiving everyone!

One of the most common misconceptions about this tasty holiday is based around some simple chemistry. The amino acid in question is Tryptophan! The most popular source of this culinary chemical on your dinner table is turkey, however there is a little myth that we need to clear up. Though turkey does contain tryptophan, you should know that turkey is actually not the most tryptophan filled food. In fact its not even close. There are several other foods that contain way more of this chemical than your Thanksgiving centerpiece.

For example eggs, soybeans, pumpkin seeds, milk, and sesame seeds all have way more tryptophan than the turkey on your plate! If you want to see a chart of tryptophan break down, follow this handy dandy Wikipedia link: http://en.wikipedia.org/wiki/Tryptophan

So, why do we get tired if its not this chemical agent? Well, the answer is actually the same as why you get tired after running a few miles, work. Your body is just working overtime to digest the vast amounts of food you are eating on Thanksgiving. So, this year when the post-dinner zzz’s find you, just know that your body is tired from digesting the mashed potatoes, cranberry sauce, rolls, green beans, pumpkin pie, and…oh yeah…the turkey.

Have a tryped out Thanksgiving everyone!

More “Turkey Day” Trivia: Thanksgiving dinner

Turkey meat:  white vs. dark - What causes the color difference between white and dark turkey meat? The type of muscle fiber determines the color of the meat. Dark turkey meat has slow contraction muscle fibers. Slow contraction muscle fibers, sometimes called slow twitch muscle fibers, are used for extended muscle contraction in endurance activities and are supplied with lots of blood vessels, mitochondria, and myoglobin pigments, which give the red color to the meat. White turkey meat, on the other hand, has fast twitch muscle fibers for short bursts of strength and speed. Fast twitch fibers have a poorer blood supply, and fewer mitochondria and myoglobin, and tire quickly.

Cranberries – Of all fresh fruits, cranberries contain the most phenols, a type of disease-fighting antioxidant. Phenols and polyphenols are strong antioxidants and many scientists believe antioxidants protect the heart.

Yams vs. sweet potatoes - A yam is not the same thing as a sweet potato. Although yams and sweet potatoes are both angiosperms (flowering plants), they are not related botanically. Yams, native to Africa and Asia, are a monocot (a plant having one embryonic seed leaf) and are related to lilies and grasses. Sweet Potatoes are a dicot (a plant having two embryonic seed leaves) and are in the morning glory family. Yams are starchier and dryer than sweet potatoes.

Pumpkin pie - Most pumpkin fillings are really custard-type fillings with eggs acting as "gelling agents". They're able to do this because proteins in the eggs unwind as they are beaten and hold the pumpkin and liquids in a gentle mesh. As it cooks, it coagulates or sets and forms a custard-like filling. If the filling is cooked too long, the protein network contracts and shrinks, causing the filling to crack across the top. To prevent the cracking, cook it a little less this year. Remove it from the oven while the center still jiggles slightly if you give it a gentle shake. It may look like it still needs a little more cooking, but remember because of latent heat, it will continue to cook after it is removed from the oven.

"Turkey Day" Trivia

Want to wow your guests at the Thanksgiving dinner table with your incredible knowledge of turkey trivia?  Check out these "Turkey Day" facts! 

• Most farm raised turkeys are White Hollands. They cannot fly.
• An adult turkey has about 3500 feathers. Big Bird’s costume (from Sesame Street) was made from nearly 4000 white turkey feathers, dyed yellow.
• Wild turkeys can glide almost a mile without flapping their wings. Over short distances, they can fly 55 mph and run 20 mph.
• Acorns are the wild turkeys’ favorite food. Because they have a poor sense of taste and smell, they choose acorns by size and shape.
• A turkey’s head will change colors when it’s excited.
• Wild turkeys spend the night in trees.
• A male turkey is called a tom, the female is called a hen and the babies, poults. Immature turkeys are called jake (male) and jenny (female).
• How to tell toms from hens:
• Toms are larger, have longer legs and bigger heads. Their wattle (growth under the chin) and snood (fleshy growth over the bill) are also longer.
• Toms grow a beard – long black feathers on their chest. The beard grows about 4 inches per year and keeps growing throughout their lifetime. Eventually, it drags the ground.
• Male turkeys gobble and females make a clucking sound.
• During mating season, a male turkey gobbles loudly and struts around, puffing out his chest, fanning his large tail and dragging his wingtips on the ground. 
• As male turkeys get older, they fight a lot and may attack humans. 
• About 180,000 wild turkeys live in Virginia, most of them in the Tidewater, South Mountain and South Piedmont regions. 

Turkey history -

• Wild turkeys are native to the eastern US and northern Mexico.  They have lived in North America for almost 10 million years. 
• Wild turkeys were domesticated in Mexico and introduced in Europe in the 16th century. 
• In the 1700s, turkeys were walked to market and wore booties to protect their feet. 
• Ben Franklin thought the wild turkey should be our national bird instead of the bald eagle. 
• Astronauts Neil Armstrong and Buzz Aldrin ate turkey for their first meal on the moon. 
• Wild turkeys almost became extinct in the early 1900s because of habitat destruction and overhunting. 
• The Turkey Trot was a ballroom dance popular in the early 1900s. The Turkey Trot 10K is a race run every Thanksgiving in Richmond.

Thanksgiving turkey facts –

• Over 45 million turkeys are eaten every Thanksgiving.
• The average American eats 17.5 pounds of turkey per year.
• US turkey production has increased over 300% since 1970.
• Turkey meat is low in fat and high in protein.
• White meat has fewer calories than dark meat.

Turkey daze...

Do you fall into a satiated stupor after Thanksgiving dinner? Have you heard that eating turkey makes you sleepy? Turkey contains tryptophan, an amino acid often blamed for the post-meal lethargy. The human body uses tryptophan to make serotonin. Studies have shown that serotonin, a type of neurotransmitter, induces sleep in nonhuman mammals and scientists believe it may do the same in humans. But don’t blame the turkey for your drowsy state. To enter the brain, tryptophan must hitch a ride through the blood-brain barrier on specialized protein transporters. Turkey contains five other amino acids in addition to tryptophan, all vying for a ride. Since tryptophan is the scarcest of the amino acids in turkey, it usually loses out in the competition.
What probably makes you sleepy after Thanksgiving dinner is dessert. Carbohydrates increase brain serotonin even though carbs contain no tryptophan. Here’s how: sweet desserts trigger your pancreas to produce insulin, a hormone that helps cells absorb glucose and amino acids. Insulin has little effect on tryptophan, but it does allow your cells to absorb other amino acids. With the others out of the way, tryptophan catches a ride into the brain and steps up the brain’s production of serotonin. Hence, the urge to snooze…
Even in the absence of dessert, you may find yourself nodding off after Thanksgiving dinner. Loading the stomach with food stretches the small intestine, causing sleepiness. All that blood going to the stomach and intestines means less blood for the brain and muscles. And then there are the beverages. Do you enjoy wine or beer with your meal? Drinks containing alcohol can also cause drowsiness. So enjoy Thanksgiving dinner but please don’t blame the bird for your turkey daze!

Turkey Trivia

1. Top 5 turkey-producing states: Minnesota, North Carolina, Arkansas, Missouri and Virginia.
2. The average American consumed 13.8 pounds of turkey in 2007.
3. Turkey sales are estimated to be $3.8 billion in 2009.
4. Towns named for the bird: Turkey, TX (2008 pop. 456), Turkey Creek, LA (361) and Turkey, NC (272)

Data from the US Census Bureau.

Another helping of cranberries, please...

Did you know, of all fresh fruits, cranberries contain the most phenols, a type of disease-fighting antioxidant? Phenols and polyphenols are strong antioxidants and many scientists believe antioxidants protect the heart. Uncooked berries, dried berries and pure juice are best because processing, storage and heating reduces antioxidant levels, but cranberry sauce still contains lots of antioxidants. So enjoy your extra serving of cranberry sauce…

Which vegetable is #1?

Would you believe it’s the sweet potato? According to nutritionists at the Center for Science and Public Interest, the sweet potato ranked #1 in nutrition when compared to other vegetables. Foods were given points for their content of dietary fiber, naturally occurring sugars and complex carbohydrates, protein, vitamins A and C, iron and calcium. Points were deducted for fat content, sodium, cholesterol, added refined sugars and caffeine. The sweet potato, with a score of 184, easily beat out the second place vegetable, the white potato, by more than 100 points. It’s easy to see why: sweet potatoes have twice the daily allowance of vitamin A, 42% of the vitamin C recommendation and 4 times the RDA of beta carotene. So this Thanksgiving Day, enjoy this yummy and good-for-you treat!