What Is Gluten?
It seems like no protein is more controversial than gluten. Everyday Einstein explains the science behind this little troublemaker.
It seems like no protein is more controversial than gluten. It shows up in all kinds of diet information, health warnings, at the doctor's office, on food labels. That little protein is everywhere. Let's learn a little more about it.
Sponsor: This podcast is brought to you by Betterment.com. Betterment offers users an easy way to invest. No prior investing experience is required. Users choose how to allocate their money between two pre-set baskets -- a stock basket and a bond basket. Signing up takes less than 5 minutes, and money can be added or withdrawn at any time without a fee. Users who sign up at http://www.betterment.com/everydayeinstein will receive a $25 account bonus as long as their initial deposit is $250 or more.
As you have probably heard if you're at all interested in this protein, gluten is the reason why dough rises. Gluten (whose name comes from the latin word for "sticky"), forms a binding matrix in the dough. This binding matrix traps the carbon dioxide generated by yeast or acid-base reactions, which causes the dough to rise.
Gluten is a protein complex made of two main parts: a glutenin protein and a gliadin protein.
Since scientists love to classify things, we like to group proteins together into "families." Gliadin is a kind of protein called a prolamine. A prolamine is a protein which plants use to store energy and which dissolves in alcohol. Each grain has a different type of prolamine. As we've mentioned, wheat's prolamine is gliadin. Barley uses a prolamine called hordein, and corn uses one called zein.
Glutenin is a kind of protein called a glutelin (if that isn't confusing enough) which can’t be dissolved in alcohol. Each grain also has their own kind of glutelin. However since glutelins don’t dissolve easily, they are more difficult to study and so aren’t well understood. Therefore they have somewhat less-imaginative names. Barley's glutelin is called "barley glutenin," while rye's is called "rye glutenin."
There are many medical conditions that come about as a result of gluten, such as celiac disease, which I'll discuss in a later episode. For many years it was believed that people with celiac disease had an immunological response to the gliadin half of gluten. Recent studies have shown that the glutenin part alone can also trigger the response.
For reasons not yet fully understood, the prolamines in barley, rye, and sorghum also trigger these responses in people with celiac, but those in corn and rice don’t. (The jury is still out on oats).
Keeping Our Glu's Straight
Since the “glu-” in gluten is just a latin root that means “sticky,” some people get a bit confused about which glu- things contain gluten and which don’t. Here are some examples:
Glutenous Rice: Just like all rice, this rice does not contain gluten. The name just means “sticky rice.”
Glutamate: As in monosodium-glutamate (MSG). Glutamate also does not contain gluten. Its name comes from the fact that it comes from glutamic acid.
Glutamic Acid: One of the basic amino acids used to form proteins. Found in just about every food with protein. Does not contain gluten. Gets its name from the fact that it was discovered when someone poured sulfuric acid on gluten back in the 1800s.
Glutamine: Another basic amino acid. Glutamine is made from glutamate by your muscles. It's also found in just about every food with protein. Does not contain gluten.
So now the next time people start taking about gluten, gliadin, and the like, you'll be ahead of the game. In a future episode, I'll take about some of the health issues surrounding this little protein.
If you liked today’s episode, you can become a fan of Everyday Einstein on Facebook or follow me on Twitter, where I’m @QDTeinstein. If you have a question that you’d like to see on a future episode, send me an email at firstname.lastname@example.org.
Investments are not FDIC Insured. No Bank Guarantee. May Lose Value.
Investing in securities involves risks, and there is always the potential of losing money when you invest in securities.
Before investing, consider your investment objectives and Betterment's charges and expenses.
Not an offer, solicitation of an offer, or advice to buy or sell securities in jurisdictions where Betterment and Betterment Securities are not registered.