Yoghurt

Pete Muriana MURIANAP at FOODSCI.PURDUE.EDU
Sat Jan 21 09:58:13 EST 1995


In article <9500207906.AA790646094 at internetmail.pr.cyanamid.com
> Steven_Projan at INTERNETMAIL.PR.CYANAMID.COM writes:
>Ted Farnworth writes:

>"I would like to know if it is common practice for medical doctors to perscribe
>yogurt to patients that have undergone surgery or antibiotic treatment in order
>to assist in the restoration of GI microflora. It would be really helpful to get
>a reference (article or textbook) where this practice is recommended."

>Eating yoghurt is probably good nutrition whether or not you have taken  
>antibiotics but the bacteria in yoghurt are not those commonly found in the GI 
>tract nor would they expect to colonize the GI tract long term. 

Steve, you pick up on a good point that seems to be perpetuated - yogurt 
bacteria are not those found in the GI tract yet professionals seemingly 
perpetuate the idea that yogurt bacteria helps restore the beneficial GI flora.

>Yoghurt cultures usually consist of  a mixture of Lactobacillus bulgaricus 
and >Streptococcus thermophilus (I think this is now called Lactococcus 
>thermophilus).

Strept. thermophilus is still Strept. thermophilus; Streptococcus lactis and 
Strept. cremoris were changed to Lactococcus lactis/cremoris based on DNA 
hybridization data which showed they really didn't belong grouped with the 
disease causing Streptococci; it was also felt that it would do these food 
starter cultures a dis-service to maintain the name relationship to disease 
causing strept's.

>Other LAB (lactic acid bacteria) can also be used.  

Well, the standard of identity for yogurt (Code of Federal Regulations) calls 
for product to be cultured with Streptococcus thermophilus and Lactobacillus 
bulgaricus (which has now been changed to Lactobacillus delbrueckii).  Some 
companies have added other bugs (Lactobacillus acidophilus) however.

>I have heard it suggested that women each yoghurt so that they may restore 
>Lactobacilli to the vaginal cavity where they provide a protective effect 
>(probably by keeping the pH low) but I am not sure how the dietary Lactobacilli 
>are supposed to migrate from the colon to the vagina.  There was an Israeli 
>group that claimed positive results by direct vaginal application of yoghurt see 
>Acta Obstet Gynecol Scand  1993 Vol:72:17-9.

That gets kind of messy; I believe lactic-containing suppositories are sold 
(parafilm?) for application of lactics as vaginal suppositories (as told to me 
by a friend who owns a culture company - makes more sense than using yogurt).

>I know this is an oft repeated repeated remedy for diarrhoae related to 
>antibiotic use but the science is not there to back it up. 
>Steve Projan
>Lederle Labs

You're correct; the milk/dairy organizations and all the related companies who 
sell milk/dairy products would love to have hard data that would substantiate 
strong advertising claims for consumption of these products.

-Peter Muriana
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