{"id":28199,"date":"2025-09-17T18:27:08","date_gmt":"2025-09-17T18:27:08","guid":{"rendered":"https:\/\/www.newsbeep.com\/nz\/28199\/"},"modified":"2025-09-17T18:27:08","modified_gmt":"2025-09-17T18:27:08","slug":"nutrition-myth-busters-can-a-snack-boost-your-memory-or-stop-dementia-in-its-tracks","status":"publish","type":"post","link":"https:\/\/www.newsbeep.com\/nz\/28199\/","title":{"rendered":"Nutrition myth busters: Can a snack boost your memory or stop dementia in its tracks?"},"content":{"rendered":"

Social media is awash with lists of brain superfoods, like walnuts, that it\u2019s claimed will prevent cognitive decline and boost IQ. Photo \/ Getty Images<\/p>\n

\n \u201cEat walnuts \u2013 they look like little brains!\u201d It\u2019s the sort of nutrition advice you\u2019ll find floating around the internet, nestled somewhere between kale smoothies and promises that blueberries will make you a genius. But is there really such a thing as \u201cbrain food\u201d? Can a snack boost
\n your memory or stop dementia in its tracks?\n <\/p>\n

The short answer: not exactly. The long answer: what\u2019s good for your heart is also good for your brain. While no single superfood will guarantee your brain health, what you eat, alongside sleep, exercise, and social connection, does play a major role in long-term brain health.<\/p>\n

Let\u2019s bust a few myths and see what the science really says about feeding your brain.<\/p>\n

Myth 1: \u201cSuperfoods\u201d make your brain smarter<\/p>\n

Blueberries, walnuts, turmeric or ginkgo \u2026 social media is awash with lists of brain superfoods that it\u2019s claimed will prevent cognitive decline and boost IQ. If only it were that easy. Dementia touches two out of three New Zealanders either directly or through family, so it\u2019s no surprise people go hunting for dietary silver bullets to boost their brain.<\/p>\n

But large studies don\u2019t point to one superfood; instead, they highlight whole eating patterns as the key to cognitive function. The Mediterranean and DASH diets, which are both rich in fruits, vegetables, wholegrains, nuts, legumes, olive oil and fish, have repeatedly been linked with slower cognitive decline, and people who adhered to a hybrid of the two, known as the MIND diet, were found to have the cognitive function of someone seven years younger.<\/p>\n

So, although blueberries, walnuts and leafy greens are great, they work best as part of a balanced, healthy diet rather than being miracle workers on their own.<\/p>\n

Myth 2: \u201cDetox\u201d or cleansing diets improve brain health<\/p>\n

The idea that detoxing the liver or kidneys can magically boost brain function is a popular one, but the truth is that our bodies are already well-equipped to handle these tasks naturally. The real key to keeping your brain supplied with nutrients and efficiently clearing waste isn\u2019t through fad detoxes but rather by maintaining a healthy cardiovascular system. After all, the brain and heart are quite literally connected by the arteries.<\/p>\n

Your brain is a high-energy organ, relying on a constant supply of oxygen and glucose carried by blood. Anything that damages the cardiovascular system, such as high blood pressure, blocked arteries, excess cholesterol or insulin resistance, also puts your brain at risk. Plus, good blood flow to the brain also supports its waste-clearance system, thus helping to keep brain cells healthy and functioning well. So, maintaining a healthy cardiovascular system is key to ensuring the brain is supplied with the nutrients it needs and the brain\u2019s waste-clearance system can work optimally. That\u2019s undoubtedly why a Mediterranean-style diet supplemented with olive oil or nuts was found to improve cognition over four years in at-risk adults, while a low-fat diet was linked to decline. In other words, protecting your arteries helps protect your neurons.<\/p>\n

Myth 3: A fatty diet is bad for your brain<\/p>\n

Not all fats are created equal when it comes to your brain. While too much saturated fat can clog blood vessels and slow nutrient delivery, healthy fats, especially omega-3 fats like DHA found in oily fish, support brain function. Because about 60% of your brain is fat. DHA helps keep brain cell membranes flexible, supports signal transmission, and shields against oxidative stress.<\/p>\n

Lower omega-3 levels have been observed in children with ADHD and older adults with cognitive decline, and have been linked to an increased risk of Alzheimer\u2019s disease. But while a fish oil supplement might seem like a quick fix, most experts agree that food sources of healthy fats work best in the context of an overall healthy diet \u2013 think oily fish such as salmon, sardines and kahawai, along with other healthy fat sources such as avocado, nuts and seeds. The bottom line: fat isn\u2019t your foe \u2013 your brain needs it to function. Just focus on the healthy kinds, especially omega-3s.<\/p>\n

Myth 4: Specific \u201cgut foods\u201d are a shortcut to better thinking<\/p>\n

Once upon a time, scientists thought your gut was just a food processor. Now we know it\u2019s more like a bustling chemical factory with a direct line to your brain. Yes, the gut-brain connection is real, but thinking that a single food can \u201crewire\u201d your mind is a stretch.<\/p>\n

The \u201cgut\u2013brain axis\u201d describes the constant conversation between the microbes in your gut and your nervous system, and diet has a key influence on that microbial community. A Western-style diet that is high in sugar, saturated fat, and ultra-processed foods is known to reduce microbial diversity, wipe out helpful species and encourage inflammatory microbes. That microbial imbalance has been linked with poorer cognitive function and a greater risk of depression.<\/p>\n

On the flip side, fibre from fruit, vegetables, legumes and wholegrains feeds beneficial microbes. In return, they produce short-chain fatty acids such as butyrate, which reduce inflammation, support gut barrier integrity, and may even influence mood and cognition, noted a 2021 special feature on brain health and diet in Nutrition Reviews. <\/p>\n

Scientists are even using the term \u201cpsychobiotics\u201d for foods or microbes that beneficially influence mood and mental health. Fermented foods such as yoghurt, kimchi, sauerkraut and kefir add beneficial microbes directly. And polyphenol-rich foods such as berries, nuts and seeds, olive oil, cocoa, coffee, and green tea appear to act like prebiotics, by feeding beneficial bacteria and helping them to proliferate in the gut. <\/p>\n

Still, the fact that many different dietary patterns have been linked to improved mental wellbeing suggests that the specific foods in the diet are less important to mental health than the overall beneficial dietary pattern \u2013 which is high in plant foods and low in ultra-processed foods, noted a 2021 review in Advances in Nutrition. <\/p>\n

Myth 5: Diet is the \u2018key\u2019 to optimal brain health<\/p>\n

No matter how much salmon or broccoli you eat, diet isn\u2019t the whole story. Cognitive resilience is built on many pillars: physical activity, good sleep, social engagement and ongoing learning, as well as what you eat.<\/p>\n

Contrary to what Instagram wellness posts would have you believe, there\u2019s no single snack or supplement that guarantees sharper thinking or a dementia-free future. But a diet that\u2019s good for your heart also supports your brain \u2013 think colourful plants, fibre, healthy fats, wholegrains, legumes, and fish. Add regular movement, quality sleep, and meaningful connection with others, and you\u2019ve got the best \u201cbrain food\u201d recipe science can currently offer. <\/p>\n

As well as Jennifer Bowden\u2019s columns in the NZ Listener magazine,listener.co.nz subscribers can access her fortnightly myth-buster column which explores food and nutrition myths.<\/p>\n

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