THE “INSULIN CAUSES obesity” hypothesis is easily tested. We can prove a causal relationship by experimentally giving insulin to a group of people and then measuring their weight gain. Therefore, for our experiment, here’s our fundamental question: If you take insulin, will you get fat? The short answer is an emphatic “Yes!” Patients who use insulin regularly and physicians who prescribe it already know the awful truth:4 the more insulin you give, the more obese you get. Insulin causes obesity. Numerous studies, conducted mostly on diabetic patients, have already demonstrated this fact.
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