Norwegian scientists developed a new system to see which survive in the human digestive system. They found that some probiotic strains survive better when consumed as fermented milks.
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Boston, MA (PRWEB) March 11, 2012
The Doctors Health Press, a publisher of various natural health newsletters, books and reports, including the popular online Doctors Health Press e-Bulletin, is lending its support to a new study identifying the best probiotic strains of bacteria, commonly found in yogurt, that promote good health.
As reported in Doctors Health Press e-Bulletin on Thursday, March 8, 2012 (http://www.doctorshealthpress.com/food-and-nutrition-articles/whats-in-your-yogurt), Norwegian scientists developed a new system to see which survive in the human digestive system. They found that some probiotic strains survive better when consumed as fermented milks.
The Doctors Health Press e-Bulletin article points out that hey tested five “Lactococcus” strains, three “Lactobacillus” strains and one “Enterococcus hirae” strain. Could the strains survive exposure to acidic conditions and bile salts — the traditional method of evaluating the potential of probiotic bacteria? The bacteria were also subjected to a process that mimicked the human digestive system, incubating the bacteria in human gastric and duodenal juices at body temperature. The bacterial strains were tested both as pure cells from cultured media and in the form of fermented milk.
They first found that Lactobacillus strains had a significantly higher acid tolerance than the others. The Lactobacillus strains showed the highest survival rate in the model digestive system, whereas the Lactococcus strains, with some exceptions, performed similarly in both systems. Interestingly, while none of the Lactococcus stains or the E. hirae strain survived in significant numbers after exposure to stomach acid, they numbers increased in the small intestine. This is interesting, because it is in the intestine that probiotics help people.
Did fermented milk protect bacteria through the digestive tract? Well, the Doctors Health Press e-Bulletin reports that results were mixed. The Lactococcus strains Af-1 and ML-8 and paracasei INF448 showed lower numbers compared with the digestion of pure bacterial cells. The other strains showed higher numbers of viable cells in comparison.
In particular, the fermented milk improved the viability of the Lactococcus strains Ar-1, Bf-2, and E. hirae INF E1 during incubation under gastric conditions.
The results here seem to confirm that foods, such as fermented milks, could help probiotics survive and thus give our bodies the great benefit they are known to give.
(SOURCE: Faye, T., et al., "Survival of Lactic Acid Bacteria from Fermented Milks in an In Vitro Digestion Model Exploring Sequential Incubation in Human Gastric and Duodenum Juice," Journal of Dairy Science, Feb. 2012; 99(2).)
Doctors Health Press e-Bulletin is a daily e-letter providing natural health news with a focus on natural healing through foods, herbs and other breakthrough health alternative treatments. For more information on Doctors Health Press, visit http://www.doctorshealthpress.com.
Victor Marchione, MD is the Chairman of the Doctors Health Press Editorial Board. He is also the editor of The Food Doctor and has released a new video revealing 12 fighting foods to help virtually all of your current health problems. To see the video, visit http://www.doctorshealthpress.com/12-fighting-foods.