News / Health

    Dietary Fiber May Prevent Asthma

    A new study finds that soluble fiber, which comes from fruits and vegetables, may reduce inflammation in the lungs.
    A new study finds that soluble fiber, which comes from fruits and vegetables, may reduce inflammation in the lungs.

    Related Articles

    Jessica Berman
    Certain types of dietary fiber may be protective against asthma, a lung disease that until recently was largely unknown in the developing world.  Experts note the incidence of asthma is increasing in less developed countries, as people there shift their eating habits away from high-fiber foods in favor of processed ones.

    We get two types of dietary fiber from food - insoluble and soluble. Insoluble fiber, from foods like whole grains, cucumbers and broccoli, includes so-called roughage, which helps cleanse the bowel.

    A new study by researchers in Switzerland suggests that soluble fiber, which comes from fruits and vegetables, and is broken down by microbes in the intestines, may reduce inflammation in the lungs. 

    Benjamin Marsland, an immunologist at the University of Lausanne, says that until recently, asthma was virtually unknown in nations where people eat a lot of soluble fiber.

    “In some countries, Burkina Faso, for example, dietary fiber intake is very high and there is no development of allergies whereas in westernized countries we have an intake of dietary fiber is low and the allergies have been increasing,” Marsland said.

    Gut bacteria break down soluble fiber, which includes pectin from apples, berries and citrus, into short chain fatty acids. Marsland says the fatty acids interact with spongy tissue inside the bones, where protective immune cells are produced, and help quiet immune system overactivity. An overzealous immune reaction can lead to inflammation.

    To see whether dietary fiber could influence disease development outside the digestive tract, such as asthma, Marsland and colleagues studied two groups of rodents.  One group of mice had been fed a diet high in soluble fiber for two weeks while the other group was fed a diet low in pectin.

    Both groups were then exposed to dust mites, a leading cause of asthma, a condition marked by lung inflammation, narrowing of the airways and wheezing.

    Marsland says the mice that ate less soluble fiber had strong allergic reactions to the dust, including the presence of inflammatory compounds in the lungs and constricted airways similar to what’s seen in people.

    The mice that consumed food rich in pectin, according to Marsland, had lower levels of the immune cells that are usually elevated in allergic asthma.

    “So the mechanism through which diet is helping the lung is the dietary fiber changes the bacteria in our intestinal tract which changes the metabolites in our circulation and this is influencing how our immune cells develop,” he said.

    Researchers confirmed their findings by injecting the mice with another short chain fatty acid.  Again, there were fewer inflammatory markers among rodents given the compound.

    An article describing a link between soluble fiber and asthma is published in the journal Nature Medicine.

    You May Like

    How Aleppo Rebels Plan to Withstand Assad's Siege

    Rebels in Aleppo are laying plans to withstand a siege by Syrian President Bashar al-Assad’s forces in likelihood the regime cuts a final main supply line running west of city

    Probe Targeting China's Statistic Head Sparks Concern

    Economists now asking what prompted government to launch an investigation only months after Wang Baoan had been vetted for crucial job

    HRW: Both Sides in Ukraine Conflict Targeted, Used Schools

    Rights group documents how both sides in Ukraine conflict carried out attacks on schools and used them for military purposes

    Featured Videos

    Your JavaScript is turned off or you have an old version of Adobe's Flash Player. Get the latest Flash player.
    Russia's Car Sales Shrink Overall, But Luxury and Economy Models See Growthi
    X
    February 10, 2016 5:54 AM
    Car sales in Russia dropped by more than a third in 2015 because of the country's economic woes. But, at the extreme ends of the car market, luxury vehicles and some economy brands are actually experiencing growth. VOA's Daniel Schearf reports from Moscow.
    Video

    Video Russia's Car Sales Shrink Overall, But Luxury and Economy Models See Growth

    Car sales in Russia dropped by more than a third in 2015 because of the country's economic woes. But, at the extreme ends of the car market, luxury vehicles and some economy brands are actually experiencing growth. VOA's Daniel Schearf reports from Moscow.
    Video

    Video Civil Rights Pioneer Remembers Struggle for Voting Rights

    February is Black History Month in the United States. The annual, month-long national observance pays tribute to important people and events that shaped the history of African Americans. VOA's Chris Simkins reports how one man fought against discrimination to help millions of blacks obtain the right to vote
    Video

    Video Jordanian Theater Group Stages Anti-Terrorism Message

    The lure of the self-styled “Islamic State” has many parents worried about their children who may be susceptible to the organization’s online propaganda. Dozens of Muslim communities in the Middle East are fighting back -- giving young adults alternatives to violence. One group in Jordan is using dramatic expression a send a family message. Mideast Broadcasting Network correspondent Haider Al Abdali shared this report with VOA. It’s narrated by Bronwyn Benito
    Video

    Video Migrant Crisis Fuels Debate Over Britain’s Future in EU

    The migrant crisis in Europe is fueling the debate in Britain ahead of a referendum on staying in the European Union that may be held this year. Prime Minister David Cameron warns that leaving the EU could lead to thousands more migrants arriving in the country. Meanwhile, tension is rising in Calais, France, where thousands of migrants are living in squalid camps. VOA's Henry Ridgwell reports.
    Video

    Video Valentine's Day Stinks for Lebanese Clowns

    This weekend, on Valentine's Day in Lebanon, love is not the only thing in the air. More than half a year after the country's trash crisis began, the stink of uncollected garbage remains on the streets. Step forward "Clown Me In," a group of clowns who use their skills for activism. Before the most romantic day of the year the clowns have released their unusual take on love in Lebanon -- in a bid to keep the pressure up and get the trash off the streets. John Owens reports from Beirut.
    Video

    Video Families Flee Aleppo for Kurdish Regions in Syria

    Not all who flee the fighting in Aleppo are trying to cross the border into Turkey. A VOA reporter caught up with several families heading for Kurdish-held areas of northern Syria.
    Video

    Video Rocky Year Ahead for Nigeria Amid Oil Price Crash

    The global fall in the price of oil has rattled the economies of many petroleum exporters, and Africa’s oil king Nigeria is no exception. As Chris Stein reports from Lagos, analysts are predicting a rough year ahead for the continent’s top producer of crude.
    Video

    Video 'No Means No' Program Targets Sexual Violence in Kenya

    The organizers of an initiative to reduce and stop rape in the informal settlements around Kenya's capital say their program is having marked success. Girls are taking self-defense classes while the boys are learning how to protect the girls and respect them. Lenny Ruvaga reports from Nairobi.
    Video

    Video Chocolate Lovers Get a Sweet History Lesson

    Observed in many countries around the world, Valentine’s Day is sometimes celebrated with chocolate festivals. But at a festival near Washington, the visitors experience a bit more than a sugar rush. They go on a sweet journey through history. VOA’s June Soh takes us to the festival.
    Video

    Video 'Smart' Bandages Could Heal Wounds More Quickly

    Simple bandages are usually seen as the first line of attack in healing small to moderate wounds and burns. But scientists say new synthetic materials with embedded microsensors could turn bandages into a much more valuable tool for emergency physicians. VOA’s George Putic reports.
    Video

    Video Researchers Use 3-D Printer to Produce Transplantable Body Parts

    Human organ transplants have become fairly common around the world in the past few decades. Researchers at various universities are coordinating their efforts to find solutions -- including teams at the University of Pennsylvania and Rice University in Houston that are experimenting with a 3-D printer -- to make blood vessels and other structures for implant. As VOA’s Greg Flakus reports from Houston, they are also using these artificial body parts to seek ways of defeating cancerous tumors.
    Video

    Video Helping the Blind 'See' Great Art

    There are 285 million blind and visually impaired people in the world who are unable to enjoy visual art at a museum. One New York photographer is trying to fix this situation by making tangible copies of the world’s masterpieces. VOA correspondent Victoria Kupchinetsky was there as visually impaired people got a feel for great art. Joy Wagner narrates her report.
    Video

    Video German Artists to Memorialize Refugees With Life Jacket Exhibit

    Sold in every kind of shop in some Turkish port towns, life jackets have become a symbol of the refugee crisis that brought a million people to Europe in 2015.  On the shores of Lesbos, Greece, German artists collect discarded life jackets as they prepare an art installation they plan to display in Germany.  For VOA, Hamada Elrasam has this report from Lesbos, Greece.
    Video

    Video E-readers Help Ease Africa's Book Shortage

    Millions of people in Africa can't read, and there's a chronic shortage of books. A non-profit organization called Worldreader is trying to help change all that one e-reader at a time. VOA’s Deborah Block tells us about a girls' school in Nairobi, Kenya where Worldreader is making a difference.