For years, carrying the ApoE4 genetic variant has been considered one of the main risk factors for developing Alzheimer's. However, current science offers a much less deterministic view.
. Although ApoE4 increases the likelihood of cognitive decline, it does not necessarily mean that a person will develop the disease.
More and more research shows that brain health depends on the interaction between genetics, metabolism, nutrition, physical activity, sleep, and inflammation. In other words, risk can be influenced by factors over which we do have the ability to act.
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The Physician and researcher Tommy Wood
argues that many everyday lifestyle decisions can have a significant impact on long-term cognitive health.
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One of the most relevant findings in recent years is the relationship between metabolic health and brain function. Insulin resistance, chronic inflammation, and oxidative stress appear to play an important role in cognitive decline and the development of neurodegenerative diseases.
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Therefore, more and more experts believe that protecting the brain also involves taking care of metabolism.
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Foods that best support cognitive function
Scientific evidence consistently points to certain dietary patterns associated with a lower risk of cognitive decline:
- Fatty fish such as sardines, salmon, or mackerel, rich in omega-3s.
. - Leafy green vegetables, a source of folates, magnesium, and antioxidants.
. - Berries, especially blueberries and raspberries, rich in polyphenols.
. - Extra virgin olive oil.
. - Nuts, especially walnuts.
. - Eggs, for their choline content, essential for memory.
. - Pure cocoa rich in flavanols.
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It is also essential to maintain an adequate intake of quality protein, necessary for the production of neurotransmitters like dopamine and serotonin.
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The gut also influences the brain
Research on the gut-brain axis has revealed that the microbiota participates in the production of substances that influence the nervous system, mood, and cognitive function.
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A diet rich in fiber, varied vegetables, and fermented foods like natural yogurt or kefir promotes a more diverse and healthy microbiota.
Dietary patterns associated with poorer brain health include:
- Ultra-processed foods.
- Added sugars.
- Sugary drinks.
- Industrial trans fats.
- Sustained caloric excess.
- Prolonged nutritional deficiencies.
All of these promote inflammation and metabolic alterations related to brain aging.
Much more than diet
Diet is a key piece, but not the only one. Physical exercise —especially strength training—, quality sleep, stress management, social relationships, continuous learning, and control of cardiovascular factors like hypertension or diabetes are part of the most robust strategy for preserving cognitive health.
Research does not claim that diet can eliminate the risk associated with ApoE4, but it does show that genes do not act in isolation. The brain responds throughout life to our metabolic conditions and daily habits, which opens a window of opportunity to positively influence the trajectory of brain aging.
