What if someone told you there is a protocol capable of protecting the brain from Alzheimer’s, improving memory, and slowing brain aging — and that it costs nothing? Would you believe it?
It exists. And it has solid scientific backing.
In July 2025, JAMA published the largest randomized clinical trial ever conducted on lifestyle-based Alzheimer’s prevention. The study, called FINGER, followed 2,111 people between 60 and 79 years old for 2 years. The result was clear: lifestyle changes improved cognitive function in a measurable way — including in people with a family history and carriers of the APOE4 gene.
Dr. Paulo breaks down what this protocol involves — and what he himself would do to protect the brain.
1. Aerobic exercise: the brain’s fertilizer
Dr. Paulo is categorical: after more than 10,000 brain surgeries over 25 years of practice, he can say with clinical precision that what protects the brain most is not a capsule, not an intravenous infusion, not an imported supplement. It is moderate-intensity physical exercise.
During aerobic exercise, the brain releases BDNF — brain-derived neurotrophic factor, a kind of neural fertilizer. BDNF stimulates the creation of new neurons, strengthens synaptic connections, and combats neuroinflammation.
The FINGER study protocol recommends 30 to 35 minutes of moderate to intense aerobic exercise, 4 times per week. A gym is not required — a brisk walk works, as long as the heart rate rises. The right intensity is one where you can talk but not sing.
For women in menopause, this point is even more critical: the drop in estrogen reduces baseline BDNF production by up to 30%. Exercise replenishes that deficit — without a prescription, without contraindications.
2. Anti-inflammatory nutrition
In practice: greens every day, berries twice a week, olive oil as the main fat, fish at least once a week, and cutting out sugar and ultra-processed foods. No mystery, no expensive supplements.
The MIND diet, derived from this eating pattern, showed up to a 53% reduction in Alzheimer’s risk among consistent followers — as detailed in the previous post in this series.
3. Daily cognitive challenge
A brain that stops learning begins to shrink. Neuroplasticity has no age limit — but it requires use.
Learning something new, reading, playing chess, playing an instrument, having deep and complex conversations — any activity that forces the brain to process information in different ways builds what Dr. Paulo calls brain reserve.
A study by researchers at the University of São Paulo showed that regularly practiced creative activities — dance, music, painting — delay brain aging by up to 7 years, drastically reducing the risk of Alzheimer’s. The mechanism is neurobiological: creativity activates simultaneous networks in the prefrontal cortex, the hippocampus, and the cerebellum, creating what is called cross-plasticity.
Those 7 years could be the difference between being present and lucid at your grandchild’s wedding — or not.
4. Quality sleep between 10 PM and 6 AM
It is during deep sleep that the glymphatic system washes the brain and eliminates accumulated toxins — including beta-amyloid protein and tau protein. Chronic sleep deprivation is one of the greatest modifiable risk factors for Alzheimer’s.
The protocol recommends quality sleep during the window between 10 PM and 6 AM — not just in quantity, but in depth. Screens before bed, bright environments, and irregular schedules all sabotage this process.
5. Real social connection and purpose
Dr. Paulo cites the Whitehall 2 study to reinforce a point many overlook: social isolation accelerates cognitive decline as much as high blood pressure and diabetes. Maintaining real bonds, responsibilities, and a sense of purpose actively protects the brain.
This is not about having an intense social life. It is about not leaving the brain without social stimulation — because circuits that go inactive for too long do not recover.
6. Morning sunlight
A simple, free habit: exposure to sunlight early in the morning regulates the biological clock, improves deep sleep — and it is precisely during deep sleep that the brain performs its deepest cleanse, eliminating the toxins linked to dementia.
What science makes clear
Up to 45% of all dementia cases worldwide could be prevented by eliminating modifiable risk factors. Aerobic exercise, quality sleep, anti-inflammatory nutrition, metabolic control, and real social connections — none of them are expensive, none of them require a prescription. All of them require a decision.
No medication approved today reverses Alzheimer’s. But neuroscience already knows what delays it — and it is within everyone’s reach.
The information in this post is based on the work of Dr. Paulo Porto de Melo, neurologist and neurosurgeon, trained at Unifesp and with a postgraduate degree from Harvard, with over 25 years of clinical experience.
Follow Dr. Paulo on Instagram: @ppmelo