Abstract
The hypothesis I want to discuss have to do with fats, fiber, and vitamin A. First, a word about the various methods of study, particularly in epidemiology. Experiment is the scientific instrument par excellence and as utilized in intervention trials in epidemiology has been called the most powerful epidemiologic tool. An example in dietary epidemiology is the current trial going on among American doctors whereby they are taking carotene or a placebo on a random basis.
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