Fraction of adult weight that is microorganisms

Range 1 - 3 %
Organism Human Homo sapiens
Reference MacDougall, Raymond (13 June 2012). "NIH Human Microbiome Project defines normal bacterial makeup of the body". 1st paragraph under "Methods and Results"
Comments "The human body contains trillions of microorganisms — outnumbering human cells by 10 to 1. Because of their small size, however, microorganisms make up only about 1 to 3 percent of the body's mass (in a 200-pound adult, that’s 2 to 6 pounds of bacteria), but play a vital role in human health." "[There is] high variability in colon size due to temporary changes in diet."
Entered by Uri M
ID 110478