4

The question is summed up in the title.

In the quest for impeccable gut flora, this concern popped up.

EDIT: Some additional information regarding the antibacterial properties of honey and the probiotic yogurt:

From a medical article regarding honey's medical applications (http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3609166/):

"Currently, many researchers have reported the antibacterial activity of honey and found that natural unheated honey has some broad-spectrum antibacterial activity when tested against pathogenic bacteria, oral bacteria as well as food spoilage bacteria"

"The Leptospermum scoparium (L. scoparium) honey,the best known of the honeys, has been reported to have an inhibitory effect on around 60 species of bacteria..."

Yogurts can contain probiotic bacteria such as Lactobacillus and probiotic yeast Saccharomyces boulardii.

That being said, I can't seem to find any resources online regarding any potential conflict between these two items. I do get a lot of yogurt + honey recipes though, so if there is any interest in that field, consider me an expert now.

Thank you for reading!

  • 1
    Hi, and welcome to the site. If you offer some results of your research (sumarized, not just links) into this question, I'll offer a (summarized, not just links) researched answer. ;) – anongoodnurse Sep 15 '15 at 21:00
  • I've updated the question, thank you! – Todd Swithers Sep 16 '15 at 15:31
  • Sorry this took so long. :( – anongoodnurse Sep 23 '15 at 7:16
  • No worries, I wasn't in any particular hurry :) I would like to say thank you, very much, for the effort you've put into your response. It's a truly interesting read, and I'm taken with the amount of information there is to explore for something as everyday as honey. Either way, this puts to rest a question that's been bobbing about in my brain stew for a long while. Thanks again! – Todd Swithers Sep 24 '15 at 20:56
  • My pleasure. I like honey for other than sweetening purposes as well, so I was really happy to see this question. What is an interesting aside is that honey also contains probiotic bacteria, something not commonly known. – anongoodnurse Sep 24 '15 at 21:02
2

Do the antimicrobial properties of honey counteract the probiotic properties of yogurt?

It appears not to. Studies using 5% (w/w) clover honey had no effect on Steptococcus thermophilus, Lactobacillus delbrukeii subsp bulgaricus and probiotics Lactobacillus acidophilus and Bifidobacterium bifidum.

You are correct that honey has been found to have antimicrobial properties against a wide range of pathogens. However, these studies are done for the scenario of using undiluted honey as a wound dressing. For example, from a recent study:

For at least 2700 years, honey has been used by humans to treat a variety of ailments through topical application, but only recently have the antiseptic and antimicrobial properties of honey been discovered. ...Clinical studies have demonstrated that application of honey to severely infected cutaneous wounds rapidly clears infection from the wound and improves tissue healing.

The broad-spectrum antimicrobial properties of honey are confirmed but the exact mechanism is unclear; it could be due to the acidity, honey's osmotic effect, presence of bacteriostatic and bactericidal factors (hydrogen peroxide, antioxidants, lysozyme, polyphenols, phenolic acids, flavonoids, methylglyoxal, and bee peptides), etc.

From a review atricle,

A bacterial level greater than 105 organisms per gram of wound tissue has been found to have a deleterious effect on wound healing in surgical and chronic wounds. [This article discusses] the inherent complexities of the clinical use of medical-grade honey... and to select clinical entities in patients who may benefit from treatment with medical-grade honey, using the evidence indicators such as the Cochrane reviews.

Studies have demonstrated that the antibacterial properties of honey are more complex than just high sugar content alone (which decreases tissue fluid to which it is applied, inhibiting bacterial growth.) As referred to above, honey contains an enzyme that converts glucose to hydrogen peroxide, an antibacterial agent. Also, as you mentioned, the antibacterial properties of honey appear to vary depending on the floral source.

Honey derived from Leptospermum trees (manuka) or Echium vulgare bush (viper's bugloss) showed antibacterial properties independent of hydrogen peroxide. It is believed that another, yet undiscovered, component of honey is responsible for the antibacterial properties.

As mentioned above, phenols are significant:

Antioxidant potential was dependent of honey extract concentration and the results showed that dark honey phenolic compounds had higher activity than the obtained from clear honey.

There have been interesting studies of susceptibility of food-borne pathogen to honey, or potential for treatment of stomach ulcers with honey, but these are in vitro

Assessment of the minimum inhibitory concentration by inclusion of manuka honey in the agar showed that all seven isolates tested had visible growth over the incubation period of 72 h prevented completely by the presence of 5% (v/v) honey.

Even in vitro, significant minimum inhibitory concentration started at about 9%, and against some organisms, 25%.

One paper isolating methylglyoxal (MGO) (and other agents) found Manuka (Leptospermum scoparium) honey had very high amounts of MGO, up to 100-fold higher compared to conventional honeys.

Whereas most of the honey samples investigated showed no inhibition in dilutions of 80% (v/v with water) or below, the samples of Manuka honey exhibited antibacterial activity when diluted to 15–30%, which corresponded to MGO concentrations of 1.1–1.8 mM. This clearly demonstrates that the pronounced antibacterial activity of New Zealand Manuka honey directly originates from MGO.

All this is to say concentration (as well as the source of the honey) matters. If one of the most consistently antibacterial honeys (manuka)has to be present in concentrations of at least 15% to be significantly antibacterial in vitro, unless you're chugging manuka honey, I don't think it will have a deleterious effect on your intestinal flora.

Growth and Acid Production by Lactic Acid Bacteria and Bifidobacteria Grown in Skim Milk Containing Honey Antimicrobial Properties of Honey
Use of Honey in Wound Care: An Update
Antioxidant and antimicrobial effects of phenolic compounds extracts of Northeast Portugal honey
Susceptibility of Helicobacter Pylori to the Antibacterial Activity of Manuka Honey
The antibacterial properties of Malaysian tualang honey against wound and enteric microorganisms in comparison to manuka honey
Identification and quantification of methylglyoxal as the dominant antibacterial constituent of Manuka (Leptospermum scoparium) honeys from New Zealand

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