Note, this study had a sample size of 100 college students, possibly self selected (selection criteria wasn't readily presented). It's really dubious to make a generalization on that.
Cache22x writes "Scientists at the University of Alberta have published the first draft of the Human Metabolome Project, the chemical equivalent of the human genome. In the same spirit as the human genome project, the information has been made freely available to the scientific community and the general public through the project's website. Knowing the makeup of the metabolome will lead to potentially enormous medical advances as clinicians now have a comparative base for analyzing the metabolite levels found in our bodies."