Table 2. Different forms of dysbiosis of the gut along with their respective causes.

Adapted from [48,49,50,51,52]

Type of dysbiosis	Cause
Deficiency dysbiosis	Reduction in the beneficial bacteria such as Lactobacilli or Bifidobacteria due to an unhealthy diet or antibiotic use and can also be associated with food intolerance
Putrefactive dysbiosis	Increase in putrefactive bacteria like Bacteroides, generally resulting from rich fat and a poor fiber diet
Fermentative dysbiosis	Reduced gastric production with increased bacterial fermentative activity
Susceptibility dysbiosis	Loss of tolerance of intestinal microbiota and alterations of gut microbiota ecosystems due to a reduced amount of probiotic bacteria, increased pathogenic microbes or pathobionts, and altered motility of the intestine
Fungal dysbiosis	Overgrowth of Candida or other fungal species in the microbiota due to a diet rich in sugar and low in fiber