Since 2005, there have been several outbreaks of foodborne illnesses that have made people sick and resulted in the deaths of some. Why don't scientists simply conduct intervention studies rather than those that are epidemiologic when some foods are thought to be contaminated so that they can be sure which foods are at fault and remove them from the food supply promptly?
Conducting intervention studies would require that scientists give contaminated foods to the research subjects. Doing so would result in some subjects becoming ill and perhaps dying. Because of the risk of becoming ill, this is not an acceptable scientific approach. Thus scientists rely on epidemiologic studies, which may suggest an association but do not prove cause and effect.
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Soil, biodiversity, energy, and water are
A) renewable natural resources. B) unlimited. C) key natural resources. D) genetically modified resources.
The U.S. Department of Health and Human Services developed a set of overall health objectives for the nation. What is this document called?
a. Dietary Guidelines for Americans 2010 b. Healthy People 2020 c. Healthy Nation 2020 d. Surgeon General's Report 2010
Which of the following can be seen as a product, but more closely resembles a service?
a. organizations b. ideas c. activities d. people
The nutrient needs of preschool children are relatively great, so it may be important to
A. serve snacks daily in addition to meals. B. serve bigger portions at meals. C. provide vitamin supplements. D. withhold liquids until after meals.