Certain foods are consistently linked to specific gut bacteria: coffee is associated with Lawsonibacter asaccharolyticus, yogurt with Streptococcus thermophilus, and milk with Bifidobacterium, suggesting that what you eat directly influences which microbes thrive in your gut.
Evidence from Studies
No evidence studies found yet.
What Would Prove This
Per GRADE and EBM methodology, here is what ideal scientific evidence would look like to definitively prove or disprove this claim, ordered from strongest to weakest.
A systematic review could determine whether the observed associations between coffee and Lawsonibacter asaccharolyticus, yogurt and Streptococcus thermophilus, and milk and Bifidobacterium are consistent across diverse populations and dietary contexts.
A systematic review and meta-analysis of at least 15 high-quality cohort and controlled feeding studies, each with >300 participants, measuring dietary intake via validated tools and microbial abundance via shotgun metagenomics, with standardized effect size calculations for each food–microbe pair across populations.
An RCT could determine whether increasing coffee intake directly increases Lawsonibacter asaccharolyticus abundance, or whether yogurt consumption directly increases Streptococcus thermophilus in the gut.
A double-blind, crossover RCT with 80 healthy adults, randomized to consume 3 cups of coffee daily (with controlled caffeine content) for 4 weeks versus placebo (decaffeinated coffee), followed by a 4-week washout, then 4 weeks of daily yogurt (150g, 10^9 CFU Streptococcus thermophilus) versus control (non-fermented milk), with stool samples collected weekly for shotgun metagenomics to measure species abundance changes.
A longitudinal cohort study could confirm whether habitual consumption of these foods predicts sustained changes in microbial abundance over time.
A prospective cohort study following 1,500 adults over 3 years, collecting monthly dietary logs and quarterly stool samples, to model whether consistent coffee, yogurt, or milk intake predicts longitudinal trajectories of Lawsonibacter asaccharolyticus, Streptococcus thermophilus, and Bifidobacterium abundance, adjusting for antibiotics, medications, and other dietary variables.
A case-control study could compare microbial abundance in individuals who regularly consume these foods versus those who avoid them, to identify consistent microbial signatures.
A case-control study comparing 150 regular coffee drinkers (>3 cups/day for >1 year) with 150 non-drinkers, 150 daily yogurt consumers with 150 non-consumers, and 150 high-milk consumers with 150 low-consumers, matched for age, BMI, and geography, with microbiome profiling via shotgun metagenomics and dietary intake validated by 7-day food diaries.
A cross-sectional study could provide a population-level snapshot of the association between these foods and microbial abundance.
A cross-sectional survey of 3,000 adults using a single 24-hour dietary recall and one-time stool sample for shotgun metagenomics to estimate the prevalence and strength of association between coffee, yogurt, milk intake and abundance of Lawsonibacter asaccharolyticus, Streptococcus thermophilus, and Bifidobacterium species.