I believe it’s come down to digestion tract length. Carnivores have short tracts (6-9 hours in and out), herbivores are long (3-4 days), and humans bring omnivores are usually 24-36 hours.
Bacteria goes through parthenogenesis (splitting into two) every 20 mins or so. So one bacterium will multiply into 262 THOUSAND bacteria whereas in a human, it can multiply to 68 BILLION.
Tl;dr
Exponential growth of bacteria in carnivores vs omnivores digestive tracts
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