Effect of ancient wheat pasta on gut microbiota composition and bacteria-derived metabolites: A randomized controlled trialOriginal paper
Karen Pendergrass is a microbiome researcher specializing in microbiome-targeted interventions (MBTIs). She systematically analyzes scientific literature to identify microbial patterns, develop hypotheses, and validate interventions. As the founder of the Microbiome Signatures Database, she bridges microbiome research with clinical practice. In 2012, based on her own investigative research, she became the first documented case of FMT for Celiac Disease, four years before the first published case study.
Read MoreWhat was studied?
This trial asked whether pasta made from ancient wheat changes the gut microbiome and its fatty-acid metabolites compared with modern wheat pasta. It was a randomized, double-blind crossover study. Participants ate one pasta type for eight weeks, then crossed over after an eight-week washout. Stool samples at each phase boundary were used for 16S rRNA sequencing and gas chromatography of short- and medium-chain fatty acids.
Who was studied?
The study enrolled 20 clinically healthy adults in Florence, Italy, comprising 9 women and 11 men with a mean age of 43.1 years. All were free of gastrointestinal disorders and celiac disease. None had used antibiotics or probiotics in the previous six months. Each person received 800 grams of unlabeled pasta per week and was told to keep usual diet and lifestyle otherwise.
What were the most important findings?
Neither diet altered overall microbiome structure or alpha and beta diversity, but both shifted specific genera. The clearest metabolic effect was on fatty acids. Ancient wheat pasta significantly raised acetic (+0.7 percent), isobutyric (+30.1 percent), 2-methylbutyric (+64.2 percent) and isovaleric (+22.5 percent) acids. Modern wheat pasta raised several branched acids too but lowered butyric acid by 31.6 percent and hexanoic acid by 66.4 percent.
What are the greatest implications of this study?
The results suggest ancient wheat pasta has a more favorable effect on anti-inflammatory short-chain fatty acids than modern wheat, without reshaping the whole microbiome. This fits the broad stability of gut communities under short dietary changes. The drop in butyric acid after modern wheat is notable given butyrate's benefits. The authors caution that the sample was small, the trial was short, and 16S resolution was limited, so larger and longer studies are needed.