Strong, Sharp and On the Ball: Nutrition for Brain Health and Cognitive Ageing
As we age, supporting brain health becomes just as important as maintaining physical health. Memory, concentration, mood, mental clarity and cognitive resilience are all influenced by nutrition and lifestyle habits throughout life.
While cognitive ageing is a natural process, emerging research suggests that dietary patterns, metabolic health, inflammation, sleep and stress all play important roles in determining how the brain functions over time. The encouraging news is that many of these factors are modifiable.
Rather than relying on a single ‘superfood’ for the brain, healthy cognitive ageing appears to be supported by consistent daily habits that nourish both the brain and nervous system.
The Brain’s High Nutrient Demand
Although the brain accounts for only around 2% of body weight, it uses approximately 20% of the body’s energy supply. It is highly metabolically active and particularly vulnerable to oxidative stress, inflammation and impaired blood sugar regulation.
Over time, factors such as insulin resistance, poor cardiovascular health, chronic stress and nutrient insufficiencies may contribute to cognitive decline, brain fog, low mood and reduced mental performance.
Importantly, many of the same lifestyle habits that support cardiovascular and metabolic health also appear protective for the brain.
Key Nutrients for Cognitive Function and Healthy Brain Ageing
Omega-3 Fatty Acids
Omega-3 fatty acids, including EPA (eicosapentaenoic acid) and DHA (docosahexaenoic acid) are key fats for brain health. EPA is especially important for helping regulate inflammation, while DHA plays a structural role in the brain itself, where it is highly concentrated. Together, they play a role in neuronal communication, memory, cognitive performance and mood regulation.
Research suggests higher omega-3 intake is associated with improved cognitive health and reduced risk of cognitive decline.
DHA and EPA are mostly found in small, oily fish such as salmon, sardines, anchovies, mackerel and herring. It is also found in algal oil (available as a supplement) for those that do not eat fish.
Plant dietary sources include chia seeds, flaxseeds and walnuts, however these contain a different omega-3 fat called ALA (alpha-linolenic acid), which is converted in the body to EPA and DHA, but not very efficiently. While these foods are an amazing source of other nutrients and healthy fats, they should not be relied upon for their EPA and DHA content.
Choline: An Often Overlooked Brain Nutrient
Choline is an essential nutrient involved in the production of acetylcholine, a neurotransmitter critical for memory, learning and nervous system signalling.
Choline also plays important roles in cell membrane integrity, methylation pathways and brain development. Low choline intake may negatively impact cognitive performance, particularly during periods of increased demand such as ageing, stress and pregnancy.
Excellent food sources include:
Eggs (yolk)
Liver
Fish
Lean meats
Soy foods
The AI for choline in Australia is 425mg/day for women. Egg yolks are one of the richest and most accessible dietary sources of choline, with one large egg contributing roughly 150mg choline.
Antioxidants and Polyphenols
Oxidative stress contributes to cellular ageing within the brain. Antioxidants and polyphenols help protect neurons from oxidative damage and support healthy inflammation pathways. These protective foods are beneficial for gut-health and the microbiome, which is also influential in overall brain function.
Protective foods include:
Blueberries
Dark leafy greens
Extra virgin olive oil
Green tea
Herbs and spices such as basil, rosemary, oregano, thyme, turmeric, garlic, cinnamon and ginger
Colourful vegetables - aim to ‘eat the rainbow’ on a daily basis
Dark chocolate (at least 75% cacao)
Choose organic where possible to limit pesticide exposure. The Mediterranean and MIND dietary patterns - both rich in polyphenol-containing plant foods - have consistently been associated with better cognitive outcomes.
Creatine and Cognitive Energy
Creatine is often associated with building muscle and exercise performance, but it is increasingly being known for its important role in brain energy metabolism, particularly in older women.
The brain requires large amounts of ATP (cellular energy), and creatine helps regenerate ATP during periods of high cognitive demand. Emerging evidence suggests creatine may support aspects of memory, mental fatigue, cognitive processing speed and cognitive resilience - particularly during times of stress, sleep deprivation or ageing.
Creatine may be especially relevant for:
Older adults
Vegetarians and vegans
Individuals under chronic stress
Those experiencing mental fatigue or the cognitive challenges of perimenopause.
Food sources include:
Red meat
Fish
Poultry
Supplementation is being increasingly researched in the context of cognitive and neurological health. If you decide to supplement, look for creatine monohydrate which has the best scientific evidence, and take alongside a carbohydrate-containing food to increase absorption.
B Vitamins
Vitamins B6, B12 and folate are involved in neurotransmitter synthesis, methylation and nervous system function.
Low vitamin B12 status may contribute to fatigue, low mood, memory difficulties and brain fog, particularly in older adults.
Sources include:
Seafood
Eggs
Legumes
Leafy greens
Whole grains
Lean meats
Magnesium and Zinc
Magnesium and zinc are two essential minerals involved in hundreds of biochemical processes within the brain and nervous system. Both play important roles in mood regulation, cognitive performance, stress resilience and healthy neurological function.
Supporting magnesium intake may help promote calmer nervous system function, better sleep quality and improved cognitive resilience during periods of stress.
Magnesium-rich foods include:
Pumpkin seeds
Almonds and cashews
Dark leafy greens
Legumes
Whole grains
Dark chocolate
Low zinc levels have been linked with impaired cognition, mood disturbances and reduced neurological function.
Foods rich in zinc include:
Oysters and seafood
Red meat
Pumpkin seeds
Chickpeas
Nuts and seeds
Eggs
Because zinc and magnesium both influence nervous system regulation and stress response, ensuring adequate intake of these minerals may be particularly important during periods of chronic stress, mental fatigue or ageing-related cognitive changes.
The Gut-Brain Axis
The gut and brain communicate bidirectionally through the gut-brain axis, involving the nervous system, immune system and gut microbiota. Emerging research suggests gut microbial diversity may influence mood, cognition and neuroinflammation. Aiming for 30+ different plant foods each week has been shown to help improve microbial diversity - this includes vegetables, fruit, nuts, seeds, legumes, herbs and spices.
Dietary patterns that support gut health and microbiome diversity may therefore also benefit the brain, including those rich in:
Fibre
Fermented foods - use these sparingly if you have histamine intolerance concerns
Polyphenols
Legumes
Vegetables and fruit
Extra virgin olive oil
Foods That May Negatively Impact Brain Health
While flexibility and enjoyment are important parts of a balanced lifestyle, diets consistently high in ultra-processed foods may negatively affect cognitive and metabolic health over time.
Ultra-Processed Foods
Ultra-processed foods are often high in refined carbohydrates and sugars, additives, unhealthy fats and sodium, while lacking fibre and micronutrients.
High intake has been associated with poorer cognition, increased inflammation and greater risk of cognitive decline.
Examples include:
Sugary breakfast cereals
Soft drinks
Deep-fried takeaway foods
Packaged snack foods
Processed meats
Highly refined baked goods
Excess Added Sugar
Frequent blood sugar spikes and insulin resistance from regularly consuming added sugars may contribute to overall inflammation and impaired cognitive function.
Blood sugar instability can also worsen:
Brain fog
Energy crashes
Irritability and mood
Poor concentration
Aim to limit excess sugar where possible and eat protein, healthy fats and fibre with meals and snacks to help buffer blood sugar spikes, slowing absorption of sugar into the bloodstream.
Trans Fats and Highly Refined Oils
Highly processed fats may negatively impact cardiovascular and metabolic health, both of which are closely linked to cognitive ageing.
Excess Alcohol Intake
Having a drink in the evening is seen as a popular way to unwind at the end of a busy day. It releases feel good endorphins and temporarily makes us feel happy and relaxed. Unfortunately this feeling doesn’t last and is often replaced with anxiety and disrupted sleep.
Regular excessive alcohol intake may also impair memory, mood regulation, sleep quality and nervous system health. It has even been shown to increase the risk of dementia and shrink parts of the brain over the long-term. If alcohol is not something you are willing to give up, then aim for a few alcohol-free days each week and reduce the amount you drink overall as a starting point.
Lifestyle Habits That Support Cognitive Ageing
Nutrition is one piece of the brain health puzzle, but cognitive wellbeing is also strongly influenced by lifestyle and emotional health.
Prioritise sleep - sleep is essential for memory consolidation, nervous system repair and clearance of metabolic waste products from the brain. In fact, the crucial waste removal system of the brain (the glymphatic system) is only active during times of deep sleep.
Support metabolic health - maintaining healthy blood sugar regulation, muscle mass and cardiovascular health appears highly protective for long-term cognitive function.
Move regularly - exercise supports blood flow, neuroplasticity, insulin sensitivity and mood regulation. Strength training may be particularly important for healthy ageing, maintaining muscle mass and metabolic resilience.
Manage chronic stress - persistent stress and elevated cortisol levels may negatively impact memory, mood and cognitive performance. Practices such as mindfulness, counselling support, creative activities, time in nature, walking and social connection can all support nervous system regulation.
Stay mentally and socially engaged - learning, creativity, conversation and purposeful activities help stimulate cognitive function and emotional wellbeing throughout life.
The Bigger Picture
Healthy cognitive ageing is not about restriction or eating the ‘perfect’ diet. It is about consistently supporting the brain through nourishing food, stable energy, restorative sleep, movement, stress management and meaningful connection.
The goal is not simply to live longer, but to age well - to maintain clarity, vitality, resilience and quality of life as we get older.
Looking for further support?
If you would like additional support on your health and nutrition journey, email me at georgie@blossominghealthnutrition.com or book a complimentary 10-15 minute discovery call or consultation through my services page here.
References
PMID: 18568016
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PMID: 27633105
https://www.health.harvard.edu/blog/ultra-processed-foods-just-say-no-202406173051
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