What number of bacteria are in the human gut?

Lots! Gut bugs... ...get blamed for obesity, ulcers, food allergies, & more. However, most o the time our normal intestinal flora can help us stay healthy.Clostridia incite production of antibodies that lock up allergens before they get into our blood. Dont decimate the good bacterial flora with unnecessary antibiotics, poor diets, frequent misguided "cleansers." Ref. ScienceDaily,8/25/2014.