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There is hardly an aspect of living in which there are more experts than in diet. Almost eveveryone tinkers with what he eats and firmly believes in what he is doing. The sad part of it is that there is so little experimentally sound evidence to support any special food pattern. Carefully conducted dietary studies with sufficiently large numbers of subjects are not common.
Currently, one of the major problems is whether the American public is eating too much of the wrong kind of fat. So important is this question that the National Diet-Heart Study, supported by the National Heart Institute, has been under way in five different centers throughout the country. This is based on evidence that reduction in blood cholesterol levels may be associated with reduction of arteriosclerotic heart disease as shown in the statistics of the population study in Framingham, Mass.
The design of a fat-controlled diet
CHANGING DIETARY HABITS. JAMA. 1966;196(3):281. doi:10.1001/jama.1966.03100160131039