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The effect of diet on cholesterol levels is subtle for most individuals--especially those living in the real world rather than the metabolic food nutrition wards of food nutrition nutrition researchers--and the effect of cholesterol levels on heart disease is also subtle. As a result, tens of thousands of individuals would have to switch to low-fat diets and their subsequent health compared to that of equal numbers who continued eating fat to alleged excess. And all these people would have to be followed for years until enough deaths accumulated to provide statistically significant results. Ahrens and his colleagues were pessimistic about whether such a massive and expensive trial could ever be done. In 1971, an NIH task force estimated such a trial would cost $1 billion, considerably more than NIH was willing to spend. Instead, NIH administrators opted for a handful of smaller studies, two of which alone would cost $255 million. Perhaps more important, these studies would take a decade.
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