Nutrition as a Science ? Scientific Method: ? Observe phenomenon ? hypothesis (educated guess) ? perform experiment(s) to test hypothesis ? Replicate findings by experiment by independant experiments ? peer review of results ? Peer Review Journals: ? Review Journals: examine all available evidence on major topics ? Research Journal: report details of the methods, research and conclusions of completed experiments ? Case Study: studies of individuals ? Epidmiological Studies: studies of populations ? usually reveal correlation, not conclusion ? Migration Studies (form of epidmiological study): studies that follow populations who move from one food environment to another (whold diet patterns) ? Intervention Studies (clinical trials) : researchers actively intervene in one group of the population and compare the results to a group that does not receive intervention ? Labortory Studies: studies performed under tightly controlled situations (involve animals) ? "p" value: probabilty of obtaining result by chance commonly set at p<5% (p<.05) ? When p value is greater than .05 it's a non-significant trend statiscally non-sigficant ? Clinical Trial ? Double Blind: both the scientists and the subjects don't know who is controlled or not ? Placebo: a fake pill such as a sugar pill
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