"Of course, this type of clinical trial isn't suited to most
nutritional research. Simply altering intake of one food or another
doesn't take into account the rest of the diet, and again, accurate
quantities are hard to come by. A well-controlled study of intake on a
metabolic ward (a hospital or clinic where participants in a study might
live or get all their foods), for example, involves actually weighing
the foods, whose composition has been scientifically determined,
given to participants. Any foods a person doesn't eat are weighed again,
and the amount actually consumed can be determined by the difference.
Obviously, this isn't conducive to learning what free-living people
really eat.
"Unless and until we develop solid means of determining what people
really eat, I'm afraid we're bound to continue to find contradictions in
nutrition research."
Reliability of Nutrition Research Questioned
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