Jenna M. Lang edited Abstract.md  about 10 years ago

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#Abstract  There is little to no information on the effects of ingested microorganisms that are simply present in our diets, and in fact, even the basic questions of which microbes, how many of them, and how much they vary from diet to diet and meal to meal, have not been answered. We characterized the microbiota of three different dietary patterns in order to determine: the average total amount of daily microbes ingested via food and beverages and their composition in the average American adult across three different dietary patterns: 1) the Average American (AA): focused on convenience foods, 2) USDA recommended (USDA): emphasizing fruits and vegetables, lean meat, dairy, and whole grains, and 3) Vegan (VEG): excluding all animal products. Meals were prepared in a home kitchen or purchased at restaurants and blended, followed by microbial analysis that included aerobic, anaerobic, yeast and mold plate counts as well as rRNA analysis for microbial ecology. The USDA meal plan had the highest total amount of microbes at 1.3 X 109 10^9^  CFU for the entire day, followed by the VEG meal plan and the AA meal plan at 6 X 106 and 1.4 X 106 CFU respectively. The 3-fold higher total amount of microbes in the USDA meal plan is likely due to the presence of fermented foods (yogurt and cottage cheese). The sequencing results as an estimate of the microbial composition of these meals showed important variation between the AA, USDA, and VEG dietary patterns. These results demonstrate that dietary patterns influence the quantity and composition of the microbes we eat, which may in turn have a significant impact on the intestinal microbiota and associated health outcomes. Studies are needed to determine the impact of ingested microbes on the intestinal microbiota, the extent of variation across foods, meals and diets, and whether dietary microbes are implicated in disease processes. The answers to these questions will reveal whether dietary microbial approaches beyond probiotics taken as supplements but rather ingested as foods are an important potential approach for modifying the intestinal microbiota in various states of dysbiosis.