I heard new WHO guidance says many demen

Start with the two things you already named — hearing and blood pressure — and add movement. Those three are the levers with the strongest family evidence behind them, and all three fit inside one Saturday visit without buying anything.

The headline is real, but it's about groups, not one person. WHO released updated guidelines on reducing cognitive decline and dementia on 15 July 2026, saying up to 45% of dementia risk is attributable to modifiable factors — tobacco, alcohol, social isolation, physical inactivity, air pollution, and conditions including high blood pressure and diabetes. That is a population estimate of how much *could* be prevented if many factors were addressed across a lifetime. It is not a promise about your parents, and no supplement sells any part of it. The Lancet Commission's 2024 list of 14 factors also names hearing loss, untreated vision loss and social isolation — the ones most households can actually move.

1) What you tried vs what works better

The Saturday visit — three levers, ~25 minutes total

1. Hearing (5 min). One question at a time, from across the room, normal voice, no shouting, no TV in the background. If they answer wrong or "what?", that's your answer for the hearing-aid check — write it down. Bring the hearing aid and its batteries; bring glasses too.
2. Blood pressure (5 min). Seated, feet flat on the floor, arm bare and supported, rest a few minutes, two readings a minute apart, and write down the time and which arm. Log it. Their usual prescribed tablet at its usual time if it's due — that adds nothing and changes nothing.
3. Movement (10 min). A 10–15 minute walk together, or the same distance in two shorter trips. Talk while you go; that covers the social part too. Repeatable enough to happen most days, not once.

Two levers that cost nothing and are easy to skip: one real social contact that week (a call or a visit, not a text), and less salt at the table using food already in the house — no new shopping. Daily alcohol is worth a gentle conversation at the next visit.

What success looks like in 24 hours — and what it doesn't mean

• Success = one walk happened, one blood-pressure log written, hearing-aid batteries found, and the appointment to review the medication list is booked. That's it.
• It does not mean memory improved. Nothing you do tonight shows up in memory this week. If nothing seems to change and the routine continues, that is still the routine working — this is measured over years.

2) Boundaries — what not to do

• No medicine changes, no extra tablets. Never stop, halve, double or share a blood-pressure tablet, and never add a supplement "to cancel out" a side effect. Bringing the whole list — including supplements — to the clinician is the action.
• No prescription medicines bought online or from an unknown seller, and no mystery powders.
• No home "fixes" for a high reading: no biting a nifedipine capsule, no extra tablet because the cuff is high. Sit, rest, log, let the clinic decide.
• Don't drop a prescription because they look well. Blood pressure is silent until it isn't.
• Don't use food or drink to manage confusion. Nothing goes into the mouth of a drowsy or muddled person.
• Don't put weight loss, sleep or mood on the family's medicine shelf. Those are clinician conversations.

3) Red flags — when to stop the home plan and get help

Go now (call your local emergency number, or go to the emergency department):

• Sudden weakness or numbness on one side, face dropping, slurred or nonsensical speech, sudden vision loss — even if it eases. Note the time they were last seen normal and say it first.
• Sudden severe headache, chest pain, breathlessness, a fit, or a fall with a head knock or groin pain, or any time spent on the floor.
• Confusion that is new — muddled since yesterday, not knowing where they are, seeing things, unusually drowsy or agitated — whether or not they already have dementia. A sudden change is a symptom to be found, not a stage of ageing. Don't wait for a fever; older adults often don't mount one. Don't settle them with a sedative.

See a clinician soon (same day or next working day):

• A home reading in the very high range — the red zone your cuff flags — even though they feel fine, or a new high reading they've never been told about.
• Standing dizziness after any recent medicine change, a missed dose, or a new supplement.
• Eating or drinking much less, or much less urine, over a day or two.
• Any fall, even with no visible injury.

Take with you: the blood-pressure log with times, every medicine and supplement in its actual box, the date anything changed, and the baseline — what they were normally like a month ago. Bring the hearing aid and glasses.

The one question for the visit, screenshot-friendly:
> "Can you review the whole list — everything prescribed, plus the supplements — and tell me which ones we should stop, and what number or symptom should bring us straight back?"

If your parents are willing, the second one for a Saturday visit, in your parents' own language if easier:
> "You do the same three things as usual — your medicine at your usual time, the walk, and the hearing aid. Nothing new. If your blood pressure reading is high, we call the clinic; we don't change anything at home."

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This is family guidance, not a diagnosis or a treatment plan — any change to a medicine (starting, stopping, or shifting the timing) is a decision for the clinician who can see the whole list. Nothing here replaces an examination.

Sources checked today, 17 October 2026: the WHO news release of 15 July 2026 on reducing cognitive decline and dementia, and a summary of the Lancet Commission's 2024 list of 14 modifiable risk factors (Alzheimer's Drug Discovery Foundation). Where those pages didn't give a figure, I've left it out rather than filling it in.

One thing I can't do from here: tell you which supplement is safe *with their specific medicines*. That pairing is exactly what the clinician or pharmacist needs to look at — and it's the fastest item on this list to get answered. Bring the bottles.