Why Fiber Is Good for Your Gut Health

Dayna McIsaac, Flickr Creative Commons // CC BY-NC-ND 2.0
Dayna McIsaac, Flickr Creative Commons // CC BY-NC-ND 2.0

Once in a while, fad diets hit on something real. Take fiber, for example. The bran-muffin craze of the 1980s may have passed, but experts still agree that eating high-fiber foods is important for the digestive system. A new study published in the journal Science explains why that might be the case—and like so many things in the gut, it all boils down to bacteria.

Our bodies are literally crawling with bacteria, inside and out, but that's not necessarily a bad thing. Our skin, guts, and mouths are unique ecosystems called microbiota. And like any ecosystem, they need balance in order to thrive.

Many studies have suggested that the recent rise in inflammation-related illnesses could be related to microbial imbalances in our guts, and that those imbalances could be tied to changes in our environment and diet. One 2016 experiment found that eating the modern American diet, low in fiber and high in processed foods, could damage not only your microbiome but those of your descendants, too.

To better understand the link between these elements, scientists analyzed the way gut microbes consume, digest, and break down fiber.

Fascinatingly, they found that it's not the fiber itself that helps—it's what happens while your microbes are digesting it. As they grind up and break down chunks of fiber, they produce compounds called short-chain fatty acids. The release of these acids tells cells in the large bowel to start gobbling up as much oxygen as they can. This, in turn, decreases the amount of oxygen being released into the gut lumen, which is the open space in the intestine that comes into direct contact with digested food.

And lower oxygen levels in the lumen are a good thing. Harmful bacteria like Salmonella and E. coli need oxygen to survive. Speaking in a statement, senior author and microbiologist Andreas Bäumler called the gut "the site of constant turf wars between microbes."

The less oxygen the pathogens get, Bäumler said, the more likely it is that helpful microbes will flourish instead.

It's an interdependent system, first author Mariana X. Byndloss explained. "The beneficial gut bacteria that are able to break down fiber don't survive in an environment rich in oxygen, which means that our microbiota and intestinal cells work together to promote a virtuous cycle that maintains gut health." 

L’Oréal’s New Wearable Sensor Keeps Track of Your Daily UV Exposure

L'Oréal USA
L'Oréal USA

Anyone who has ever suffered a sunburn knows that too much exposure to UV radiation is bad for your skin. But in the moment, it can be hard to tell when you’ve gotten too much sun—especially during the winter, when you might not think you need sunscreen. (In reality, snow reflects up to 80 percent of the sun’s UV light, so you may end up getting hit with the same rays twice.) A new wearable sensor spotted by Wired aims to make understanding your sun exposure a whole lot easier.

L'Oréal’s new La Roche-Posay My Skin Track UV sensor pairs with a smartphone app to alert users when they’ve had high levels of UV exposure. Developed by L'Oréal’s Tech Incubator in collaboration with Northwestern University engineering professor John Rogers and Swiss designer Yves Béhar, the sensor measures UVA rays (which are associated with skin aging and skin cancer) and uses an algorithm to calculate UVB exposure (which is associated with sunburn and skin cancer).

The UV sensor
L'Oréal USA

At only half an inch tall and 1.3 inches long, the waterproof sensor is designed to be discreetly attached to your clothes, watchband, or sunglasses. The sensor's LED detector measures UV rays as sunlight passes through a small window in the device, then transfers the data to your phone via a near-field communication (the same technology in some hotel key cards). It stores the photons from the UV rays in a capacitor, eliminating the need for a battery.

Based on this data, the My Skin Track app can tell you how close you're getting to the maximum limit of UV exposure doctors recommend per day. It also provides updates about the air quality, pollen count, and humidity wherever you are at any given moment. Based on this information, as well as data about your specific skin type and skin tone, the app's Skin Advice feature will provide customized tips for keeping your skin healthy. It also recommends specific products—La Roche-Posay items can be bought directly through the app, should you desire.

The sensors are exclusively available through Apple stores. You can order one online for $59.95.

[h/t Wired]

Massive Salmonella Outbreak Linked to Raw Turkey Just Days Before Thanksgiving

iStock.com/kajakiki
iStock.com/kajakiki

The U.S. has been in the midst of a salmonella outbreak for more than a year, with the bacteria contaminating everything from cereal to snack foods as well as raw poultry. Now health experts warn that your Thanksgiving dinner may put you at risk for infection. As ABC reports, salmonella has been traced back to a number of turkey products, and Consumer Reports is urging the USDA to name the compromised brands ahead of the holiday.

The drug-resistant strain of salmonella linked to the recent outbreak has been detected in samples taken from live turkeys, raw turkey products, and turkey pet food, according to the Centers for Disease Control and Prevention (CDC). Since November 5, 2017, 164 people in 35 states have contracted the infection from a variety of products.

While many of the items linked to the salmonella outbreak have been pulled from shelves, the potentially contaminated turkey brands have yet to be identified. In a news release, Consumer Reports urged the USDA to release this information in time for consumers to do their Thanksgiving shopping.

"The USDA should immediately make public which turkey producers, suppliers, and brands are involved in this outbreak—especially with Thanksgiving right around the corner," Jean Halloran, director of food policy initiatives for Consumers Union (the policy department of Consumer Reports), said in a statement. "This information could save lives and help ensure consumers take the precautions needed to prevent anyone in their home from getting sick."

Even if specific brands aren't flagged before November 22, the CDC isn't telling consumers to skip the turkey altogether. Instead, home cooks are encouraged to practice the same safety precautions they normally would when preparing poultry. To avoid salmonella poisoning, start with a clean work area and utensils and wash your hands and counter thoroughly before and after preparing the bird. But skip washing the bird itself, as this can actually do more to spread around harmful pathogens.

Cook your turkey until the meatiest part reaches an internal temperature of 165°F. And if you're looking for a way to make sure the juiciest parts of the turkey cook through without drying out your white meat, consider cooking the parts separately.

[h/t ABC]

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