Even if we grant that it is generally warranted to make inferences about human physiology from that of rats, it is not warranted to infer from the fact that vitamin E deficiency seems to hasten ageing to the claim that vitamin E is the secret of everlasting youth. The proposition that a lack of something (vitamin E) causes X (hastened ageing) does not entail the proposition that the presence of that thing (vitamin E) causes the opposite of X (slowed ageing). We can use a reconstruction to expose the mistaken causal assumption driving this fallacy (P2):

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