Dairy products identified as key delivery vehicle for probiotics

by Donna Berry and Keith Nunes
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Research shows that how a probiotic is delivered may influence its effectiveness.

Dairy products continue to be the primary delivery vehicle for food and beverage products featuring probiotic cultures, according to data provided by Label Insight, Chicago, a firm that captures the information on product labels and then mines the data for insights into marketing and product development trends. Within dairy products, yogurt continues to lead the way as manufacturers seek points of differentiation in a crowded marketplace, but manufacturers are working with other dairy-based applications.

For example, Brooklyn-based yogurt maker The White Moustache has introduced a line of beverages made with acid whey that contain live probiotics and calcium. Flavors include ginger, sweet beet, honey lime, pineapple and passion fruit, as well as a plain variety that may be used in smoothies or juices.

Dairy’s role as a key source of delivery for probiotics came further into focus with the July 10 on-line issue of Applied and Environmental Microbiology, a journal of the American Society for Microbiology. The issue included results from a study investigating the potential benefits of consuming probiotics via dairy foods, rather than a different food or supplement matrix. Findings indicate the manner in which a probiotic is delivered may influence how effective that probiotic is in delivering the desired health benefits.

The study will be published in the September 2015 print edition. Researchers investigated the probiotic strain Lactobacillus casei BL23 in a mouse model of inflammatory bowel disease. The mice that ingested the probiotic in milk had reduced symptoms compared to the control fed milk without the probiotic or the mice that received the probiotic within a non-food, supplement-like format.

Corresponding author Maria Marco, Ph.D., an associate professor in the Department of Food Science and Technology at the University of California at Davis, shared some background on the research and highlights from the study.

“It has long been assumed that the manner in which probiotics are consumed does not really make a difference for their effectiveness in the digestive tract,” Dr. Marco said. “However, literature searches reveal that only one (underpowered) human study performed in the early 1990s and very few pre-clinical (rodent) studies have actually done side-by-side comparisons with probiotics in different matrices.

Our paper shows that it is time to reexamine this assumption. We found that consuming L. casei in milk and not a nutrient-free matrix resulted in significantly higher levels of protection again intestinal inflammation in a mouse model of inflammatory bowel disease. An important next step will be to see if this type of result is repeatable in humans.

Dr. Marco said there are a number of reasons why dairy is commonly associated with probiotics.

“First, fermented dairy products such as yogurt are generally understood to contain living microbes,” she said. “Hence, it is less of a stretch to accept living probiotic strains in such products. Second, unlike many other fermented foods, dairy products are typically not pasteurized or heat treated at the end of production, which ensures probiotic viability. Third, bacteria related to probiotics have been well studied for their growth and survival in dairy products hence some of that research can be applied to examine probiotic strains.”

On Aug. 4, the nutritional company Morning Sunshine Kitchen introduced Pro2Bites protein and probiotic cookies.

Dr. Marco said knowing bacteria may adapt to their surroundings was one reason she was interested in measuring whether the delivery matrix mattered at all with regard to probiotic efficacy.

“Dairy was the logical choice for this work because L. casei is often incorporated into dairy products,” she said.

The study took place over three years and involved two of Dr. Marco’s Ph.D. students — Bokyung Lee and Xiaochen Yin — who also authored the report.

“We were all pleased and excited by the findings, especially in light of the fact that this type of study is rather unique,” she said. “We had hypothesized that the conditions probiotics are exposed to prior to ingestion might influence their capacity to maintain or improve human health. So for this study, we took a census of the microbiota before and after ingestion of L. casei and learned that consumption did not significantly alter the populations or diversity of most of the resident gut bacteria. This suggests that the benefits of the probiotic involve a direct effect of L. casei, or of a metabolic product of these bacteria upon the intestinal epithelium, rather than a global alteration of the indigenous intestinal microbiota.”

Dr. Marco said the industry should discuss the role of probiotic-containing milk and other dairy products in promoting a healthy digestive tract through modulating the intestinal microbiome.

“The dairy industry should also be encouraged by the emerging consumer interest in fermented foods and work to educate the public on why dairy products are different than foods such as sauerkraut,” she said. “The industry can also address the beneficial roles that microorganisms have in making fermented dairy foods and in human health.

“Human studies are needed, however, as well are mechanistic studies. These can identify the specific cell products made by probiotics and the reciprocal host cell response pathways that recognize and respond to those cell products that ultimately result in health benefits.

“We must remember, however, that while milk was a good carrier for L. casei in this study, dairy might not always be the best choice for all probiotics and health conditions.”

On Aug. 4, for example, the nutritional company Morning Sunshine Kitchen introduced Pro2Bites protein and probiotic cookies. The cookies contain whole grain prebiotics and a daily dose of Ganeden BC30, a probiotic culture supplied by Ganeden, Cleveland, for digestive and immune support. The new products are available in four varieties, including dark chocolate flax; Rise and Shine, which features whole grain rolled oats, almonds, dark chocolate chips, cacao nibs, chia seed and is infused with cold brewed coffee; five spice ginger cashew; and peanut butter berry.

“We had been looking at Ganeden for a while, and based on the growth of the probiotic market we identified an opportunity to work with Geneden to include their amazing probiotic Ganeden BC30 in our nutritional cookies,” said Lisa Harris, founder of Morning Sunshine Kitchen. “We increased our product’s functionality and took a ‘bite’ out of the market.”

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