Picture your neighbor Bob, 58, runs every morning, no memory complaints, eats fine. Now he's on a daily shot that makes him nauseous, shrinks his muscle mass, and costs hundreds a month — all because we maybe think it helps brains someday. That's not medicine, that's a gamble with Bob's body. These drugs have real side effects and we don't have long-term proof they protect healthy brains. The studies show promise for people with diabetes or obesity, not everyone with a pulse. Until we know who actually benefits, prescribing to all over 50 is reckless.

Here's a fact that gets lost: in the clinical trials, about 1 in 10 people quit because of nausea and vomiting, and up to 40% of the weight they lose is muscle. For someone over 50, that muscle loss means falls, fractures, and hospital stays — all of which are major dementia risk factors themselves. You'd be trading an unproven brain benefit for a proven frailty risk. And the statin analogy doesn't hold. Statins are cheap, decades-proven, and we test cholesterol. We have no test telling us which healthy brains need this, and the only way to find out is pumping everyone full of an expensive drug that makes them sick. That's not prevention, that's roulette.

You keep saying we can monitor Bob closely, but monitoring doesn't undo a hip fracture or the muscle he'll never get back. That's a permanent cost for a maybe-benefit. And statins aren't given to everyone over 50 — we test your cholesterol first. There's no brain test here. You're asking millions of healthy people to accept real, proven harms for an unproven hope. That's not a trade-off, that's a leap of faith nobody should take with someone else's body.