- “refined wheat breads .. the abundance of bacteria related to Bacteroides vulgatus, decreased..” .
- “Polydextrose … BACTEROIDES: species (B. fragilis, B. vulgatus, and B. intermedius) decreased” 
- “Rats on the all-rice diet had significantly lower faecal concentrations of the main menaquinone-producing bacterial species (Bacteroides fragilis and Bacteroides vulgatus) than animals on either of the other two diets ( a rice + beans diet or a stock diet)” 
- The suppressive effect of bifidobacteria on Bacteroides vulgatus, a putative pathogenic microbe in inflammatory bowel disease.
- ” Bifidobacterium infantis 1222 highly inhibited the growth of B. vulgatus in the coculture”
- “bifidobacteria-fermented milk…showed a significant reduction in the relative proportion of B. vulgatus” 
- “L. reuteri strain…Bacteroides vulgatus were decreased,” 
- “Lactobacillus rhamnosus GG or Lactobacillus plantarum 299v ..did not prevent colitis in B vulgatus”  — technically no effect
- “pulverized petal of Rosa rugosa… the growth of Bacteroides vulgatus, Escherichia coli, Staphylococcus aureus, and Bacillus cereus was completely inhibited” 
Above we see a lot of items to avoid. In terms of items to take, we have just a few
- L. Reuteri probiotics
- Bifidobacteria probiotics
- Reduce consumption of beans
THIS IS NOT MEDICAL ADVICE — this post is an education summary of what has been reported on PubMed. Always consult with a knowledgeable medical professional before changing diet, supplements and prescription drugs.