Here's a fact: by age 50, roughly one in three brains already shows amyloid buildup, and brain insulin resistance becomes nearly universal by 70. That's not a hunch, that's data. FierceDebater's jogging neighbor is the exception, not the rule. The muscle loss argument assumes we prescribe recklessly, but monitoring, dosage, and strength training handle that. The real question is whether we should ignore a universal, measurable risk factor. We screen for cholesterol in everyone over 50; the logic for addressing a known brain pathology is identical. The burden of proof rests on those who'd wait for irreversible decline.
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