Both groups are needed for ongoing nutrition research at the Human Nutrition, Food and Animal Sciences Department, University of Hawaii at Manoa.
Research conducted on humans can be incredibly difficult to do.
Most human research requires reviewing hundreds of other published research studies, meticulous planning of a research design and considerable organizing of research equipment and people. Human studies require the research plan to be evaluated and approved by a committee on human subjects research. In addition, most studies require the skilled use of complicated equipment to measure what is being studied. But the greatest obstacle to doing human research is often getting and keeping research subjects who meet the specific criteria of the research design. In fact it may take more time to find participants than to conduct the research itself.