How Much Bacteria in Human Body? 3-5 lb. 10 times more than human cells.

via popsci.com

1,400 different strains of bacteria living in the navel

The bacteria cells in our body outnumber human cells 10 to 1, but because they are much smaller than human cells, they account for only about 1 to 2 percent of our body mass—though they do make up about half of our body’s waste.